Frieda Caplan changed the supermarket produce section

It all started accidentally. Frieda Caplan, new mother and UCLA political science graduate, was looking for a job with flexible hours. Through her relatives she found an opening at Giumarra Brothers Fruit Co.'s stall in the wholesale produce terminal in downtown Los Angeles.

One day she spied some fresh brown mushrooms while working at the register. In the early '60s, the fungus was considered gourmet, and previously only available in a can imported from Taiwan. Soon, thanks to Caplan's efforts, a large market with several locations placed an order for a hundred cases, which was too big for Giumarra Brothers to fill.

So Caplan packed her infant daughter in her car and drove 40 miles to the closest mushroom farm, where she helped pack boxes until the order was filled. She was hooked on the experience.

Eventually, she opened her own business as a specialty produce wholesaler, and went on to became one of the most influential people in the produce industry.

Caplan's entrepreneurial rise is the subject of an engaging new documentary, "Fear No Fruit," about her success in the male-dominated produce world. In 1962, when Caplan stepped into the Los Angeles Produce Market, the produce arena was filled with simple foods like single red tomatoes, unwrapped iceberg lettuce and green bell peppers, never red unless they were left to ripen on the vine.

Today, the produce section is the most profitable part of the supermarket. In 2014, sales in fruits and vegetables amounted to approximately $7.34 billion. The extraordinary selection found in the bins today is due, in part, to Caplan, who is credited with introducing the U.S. market to more than 200 fruits and vegetables — everything from fiddleheads to jicama and finger limes.

"Talk to the woman in back," men would say when someone pulled up with an unusual item that they wanted to distribute through the market. Or when Safeway called to ask if anyone had a lead on the Chinese gooseberry, a one-off request for the strange fuzzy fruit. No problem, Caplan said. She filled the order, and — according to the film — even coined the name kiwifruit after the kiwi, the flightless bird native to New Zealand.

"Mom went to Harry Vickman [owner of the local cafe] and asked him to make kiwi tarts. She offered the tarts to produce buyers as a way to get them to try the fruit. This was hugely innovative."

Consumers had to be educated along with brokers. When sunchokes hit the market alongside ginger, no one could tell the difference between the two. Caplan packaged up a small flat of sunchokes and stuck a label on it. She also made fliers about what people were sampling — imagine buying a spaghetti squash and having no idea what was inside the hard yellow exterior — and included recipes on the stickers. Throughout the 97-minute film, we meet other big names in the produce world that you might not know, like David Karp, the fruit detective; Phil Lempert, the Supermarket Guru; and Al Courchesne, the farmer who started Frog Hollow Farms. Through these introductions, we get a fascinating behind-the-scenes glimpse at the sourcing, merchandising and selling of everyday fruits and vegetables.

We also get to know the Caplan family, who have continued Frieda's legacy at the female-owned, family-led company. Her daughter Karen was 15 when she first joined her mom at the office. Karen's eldest daughter, Alex, also found her way into the specialty produce industry.

Caplan — who at 92 continues to go to the office every day — says she still welcomes the "next big thing," like the Stokes purple sweet potato, a Northern California variety she helped develop that has since become one of their top sellers. Diversity like this "elevates our industry as a whole and keeps us on our toes," she says.

With an estimated 20,000 to 80,000 fruits and vegetables that are grown but not developed commercially, specialty farmers and produce sellers still have plenty of options before they run out of things to introduce.