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UC Food Safety

UC Food Blog

Time to enjoy California kiwifruit

In early November, when California stonefruit and grape supplies are waning, kiwifruit comes to the rescue. It's beautiful green flesh, tart flavor and excellent nutrient profile make it a great choice for snacking and fruit salads as the holidays approach.

Kiwis are native to China, but are commonly associated with New Zealand. Called the Chinese gooseberry, they were renamed "kiwifruit" - after flightless birds native to New Zealand - for the export market in the 1950s.

A 1997 study that examined the 27 most commonly eaten fruits found kiwis to be the fourth most nutrient dense, following papayas, mangos and oranges, according to the Network for a Healthy California's Harvest of the Month. Kiwi fruit are high in vitamin C and vitamin K, they are a good source of fiber and contain potassium, folate, beta-carotene and lutein.

Kiwifruit enthusiasts recommend eating the skin, which contains a high amount of fiber and provides access to nutrients which accumulate just below the skin. But I personally cannot get beyond the fuzzy texture and brown, leathery appearance. A convenient way to eat a ripe kiwi is by cutting it in half and scooping out the pulp with a spoon.

Nearly all U.S. kiwis are produced in California. Botanically a berry, they grown on large, tender vines that can reach a height of 15 to 30 feet. The vines bloom in May and the majority of fruit is harvested in late October and early November.

Posted on Friday, November 5, 2010 at 7:49 AM

What is the world's most popular meat?

I’ll bet a lot of you guessed chicken or pork. Some of you probably thought beef. Surprise! In the United States, we tend to consume chicken as our white meat of choice and beef as our red meat, but 63 percent of the world's population eats goat meat. Interestingly, more and more goat meat is being consumed in the United States and not just as an ethnic dish due to the growing ethnic population. The health-conscious consumer is also looking at the benefits of incorporating either cabrito (a delicacy meat from goats that are harvested between 1 to 3 months of age and weigh less than 50 pounds) or chevon (goats that are harvested between 6 to 9 months of age and weigh between 50 and 75 pounds). Older goat meat is also consumed but usually as sausage or in chili.

Mendocino and Lake livestock producers, especially those who want to sell local, might want to consider adding goats to their mix of cattle and/or sheep. I know some are already ahead of the curve (see our goat producer directory). Multi-species grazing on our rangelands not only provides economic diversity for the ranch but utilizes our rangeland forages better than single-species grazing. But let’s get back to that health-conscious consumer and why demand for goat meat is growing.

The table below shows the nutrient comparison of goat meat to traditionally raised chicken, beef, pork and lamb.

Nutrient composition of goat and other types of meat1, 2













Fat (g)






Saturated Fat (g)






Protein (g)






Cholesterol (mg)






1 Per 3 oz. of cooked meat

2 USDA Nutrient Database for Standard Reference, Release 14 (2001)

You can see that goat meat is lower in calories, total fat, saturated fat, and cholesterol than the other meats. Less saturated fat and less cholesterol mean healthier red meat for the health-conscious consumer. Additionally, goat meat has higher levels of iron (3.2mg) when compared to a similar serving size of beef (2.9 mg), pork (2.7 mg), lamb (1.4 mg), and chicken (1.5 mg). Comparatively, goat meat also contains higher potassium and lower sodium levels. In terms of essential amino acids, goat meat closely resembles beef and lamb.

With these benefits, it’s clear why consumers are developing an interest in eating goat meat.

Posted on Wednesday, November 3, 2010 at 7:29 AM

The more you know, the more careful you are

With a daughter soon to complete a degree in health safety, discussions of Salmonella, E. coli and the like sometimes arise as we sit around the dinner table. As an agriculturally focused family, we like to think we’re pretty savvy about the best way to handle our produce to keep it safe and tasty.

Some are very concerned about food safety. A gentleman phoned the Postharvest Technology Center a few months ago, and shared that he was very concerned about eating strawberries. He thought perhaps he should scrub each one with a soft toothbrush, and then soak them in a diluted chlorine bath.

Others are much less aware of food safety concerns, sometimes using cutting boards and knives interchangeably between raw meat and produce items, or other unsafe food handling practices.

Dr. Roberta Cook, a marketing and postharvest specialist affiliated with the center reported, “in 2008, 53 percent of shoppers interviewed in a national survey by the Food Marketing Institute, named ‘bacteria or germs’ as a serious health risk to their food, ranking it as their number one concern.”  The produce industry and the U.S. Food and Drug Administration continue to work hard to establish safe procedures for every step between the farm and the market.

Dr. Linda Harris, a food safety specialist, and Dr. Christine Bruhn, a consumer food marketing dpecialist, also affiliated with the Postharvest Technology Center, offer the following concise steps for the safe handling of produce:

  1. In the grocery cart and at home, keep fruits and vegetables separated from raw meat, poultry, and seafood to prevent cross-contamination.

  2. Once at home, store all fresh-cut ready-to-eat prepared produce in the refrigerator to keep it cold.

  3. Wash all whole fruits and vegetables, including larger items like melons, just before preparation for eating. Cut out damaged (bruised, discolored) areas before eating.

  4. Before and after handling fruits and vegetables, make sure that your work area and utensils are clean and that your hands have been washed with hot soapy water.

  5. Fruits and vegetables should be washed under running water. Soaking them in water increases the opportunity for cross-contamination and is not recommended.

  6. Produce such as apples, cucumbers and melons that can be rubbed without damage should be scrubbed using clean hands or a clean scrub brush.

  7. Dry washed fruits and vegetables with clean disposable paper towels.

  8. It is not necessary to wash ready-to-eat prewashed and packaged fresh-cut produce. If you choose to rewash this type of produce, follow the instructions above. Always wash unpackaged prepared salad mixes under running water prior to consumption.

  9. Once cut or prepared, all fruits and vegetables should be refrigerated promptly. After serving, refrigerate leftovers within 2 hours.

Additional produce safety resources:

"How to Properly Wash your Produce" video by Dr. Christine Bruhn.

For more University of California information about the safe handling of fruits and vegetables:

UC Home Gardening, Preservation and Storage Publications

Safe Handling of Fruits and Vegetables (pdf)

Food safety brochure (pdf)

Posted on Monday, November 1, 2010 at 7:19 AM
  • Author: Mary E. Reed

Honey, I'm homemade!

The bees did it.

Well, they enabled it.

Take a look at one of May Berenbaum’s favorite honey recipes and you’ll know why she calls it “Apiscotti” or “Bee-Enabled Biscotti.”

Seven of the 12 ingredients (butter, honey, almond extract, nutmeg, cranberries, cherries, and almonds) depend on the pollination services of the honey bee, Apis mellifera.

May Berenbaum, professor and head of the University of Illinois Department of Entomology, kindly shared the recipe below.

You may know her as an entomologist, an administrator, a honey bee researcher, a book author, a columnist (American Entomologist), an opinion page writer (see her piece on bed bugs in the New York Times) a wife and a mother.

But not a beekeeper

“Although I’m an entomologist, I’m not in any sense of the word a beekeeper,” she writes in her newly published book, Honey, I'm Homemade: Sweet Treats from the Beehive Across the Centuries and Around the World, a project that benefits the University of Illinois Pollinatarium, the nation's first free-standing science outreach center devoted to flowering plants and their pollinators.

“At various intervals during my life I’ve been a bee landlord—other entomologists have kept bees on property I own—but I’ve never personally had a hive I could call my own or been involved in the production of honey. Truth be told, I’m a little afraid of honey bees—and not just because they can sting. The stings are a manageable risk. What I find unnerving about bees is how eerily talented they are and how profoundly different from the million-plus other species of insects.”

Berenbaum, a fellow of the American Academy of Arts and a member of the National Academy of Sciences, says that honey is a unique food “because of its power to evoke a particular time and place. Every time it is collected from a hive, honey takes on the nuanced flavors of a particular set of flowers--clover, orange blossoms, buckwheat, or others--at a certain point in time processed and stored by a particular group of bees. Honey is not just a snapshot of a time and place--it's the taste of a time and place, and it lends its flavors to the delectable baked goods and other treats found here.”

Indeed, we’re glad to see a project benefitting the Pollinatarium and heralding the humble honey bee. In pollination services alone, honey bees contribute approximately $20 billion annually to American agriculture. And the value of the 2008 honey crop totaled more than $226 million, Berenbaum points out.

Without the honey bee, there would be no Apiscotti—or most of the other foods we enjoy. And that would bee disastrous.

Here’s her recipe for Apiscotti.

Apiscotti (Bee-enabled Biscotti)

1/2 cup butter
1/2 cup sugar
1/4 cup honey
3 eggs
1/2 teaspoon salt
1 teaspoon almond extract 
1/4 teaspoon nutmeg
2 teaspoons baking powder
2 1/2 to 3 cups flour
1/2 dried cranberries, chopped
1/2 cup dried cherries, chopped
1/2 cup blanched sliced almonds, chopped

Preheat oven to 350 degrees. Cream sugar and butter together; mix in honey until smooth. Beat eggs until frothy and then add salt, almond extract, nutmeg, and baking powder. Combine the sugar-butter mixture with the egg mixture. Add flour until dough is a consistency that can be handled. Refrigerate dough for 1 hour or more.

Divide chilled dough into 3 parts and flatten each third into a rectangle (use additional flour to make handling easier if necessary). Place a line at the center of each flattened section of dough and fill with chopped cherries, cranberries, and nuts. Fold the sides of each rectangle over to form a loaf, filling in center, and seal.

Place loaves on greased cookie sheet at 350 degrees for 45 minutes to 1 hour, or until golden brown. Slice on a slant while hot into 1/2-inch slices. For crispier slices, return to oven for 5–10 minutes, or until golden brown (the color of a honey bee).

Posted on Friday, October 29, 2010 at 7:16 AM

Research helps ensure safety of leafy greens

Four years ago, a multi-state outbreak of E. coli O157:H7 in fresh baby spinach gripped the nation. Nearly 200 people in 26 states came down with the disease. Two elderly women and a 2-year-old boy died.

The outbreak was also devastating for the industry. The contaminated spinach was traced back to Central California, where growers produce 80 percent of the nation’s leafy greens. Scientists, farmers and regulators worked together to restore public confidence in products that are widely considered part of a healthy diet.  Regulators and farmers created the California Leafy Green Marketing Agreement to establish a culture of food safety on leafy greens farms and researchers worked to close gaps in the body of scientific knowledge about the sources of E. coli O157:H7 in the region.

In 2006, UC and USDA researchers were already designing a four-year study of the possible sources of E. coli O157:H7 near Central California fresh produce fields when the high-profile spinach outbreak occurred. This month, data collection from rangeland and farmland, steams and irrigation canals comes to a close. The team of scientists is now analyzing the data to reach conclusions that will help prevent future food contamination.

Preliminary results reflect a diversity of E. coli O157:H7 carriers near Central Coast farms, according to Edward (Rob) Atwill, a UC Davis School of Veterinary Medicine specialist in waterborne infectious diseases and co-principal investigator of the study. Early on, free-ranging feral swine were implicated as carriers of the deadly bacteria, but it wasn’t known whether there were other sources in the environment. The researchers collected 1,233 samples of wild and feral animal scat from 38 Central Coast cattle ranches and leafy greens farms that were adjacent to riparian, annual grassland and oak woodland habitat. Eighteen of the samples were found to contain E. coli O157:H7.

The scientists found the bacteria in

  • 3 of 60 brown-headed cowbirds
  • 5 of 93 American crows
  • 2 of 95 coyotes
  • 1 of 72 deer mice
  • 10 of 200 feral swine

E. coli O157:H7 was not found in scat samples from deer, opossums, raccoons, skunks, ground squirrels, or other bird and mouse species.

“Our goal over the next nine months is to finish analyzing this very large and comprehensive dataset and to identify various good agricultural practices that reduce the risk of foodborne pathogens for the produce industry,” Atwill said.

Posted on Wednesday, October 27, 2010 at 7:04 AM

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