The Prince of Wales and the Duchess of Cornwall have sampled further organic delights as they visited an "edible school yard" near San Francisco.
Charles and Camilla enjoyed the fruits of the students' labour
Camilla enjoyed a slice of pizza while Charles told children he was "thankful for all nature's gifts" as he ate some autumn harvest soup.
All the food was made by children, who are taught how to grow and cook organic food at the garden in Berkeley.
The US visit earlier took in a farmers' market in the Californian hills.
Camilla, taking a mouthful of the pizza, made with potato, onion and rosemary from the garden, said: "I'm always eating."
The prince warned her: "Don't darling - it's hot," noticing she had some food stuck on her lip.
The prince wore a University of California tie
Inside the kitchen, the couple sat with children to enjoy the soup.
The garden was dreamed up by one of America's best-known restaurateurs, Alice Waters.
Her Chez Panisse Foundation, named after her own restaurant, transformed wasteland at the Martin Luther King Middle School into the one-acre garden 10 years ago.
Up to 350 children, between the ages of 12 and 14, now have weekly lessons on how to look after chickens and prepare their own food.
Ms Waters, who accepted the idea that she was the US equivalent of Jamie Oliver, said she thought the royal visit would bring much-needed recognition to the project.
"Everybody needs a prince," she added.
Camilla, wearing a long blue coat, and Charles, wearing a University of California tie, were greeted with huge cheers as they arrived at the school.
They were greeted by Ms Waters and Maria Shriver, wife of California governor Arnold Schwarzenegger.
The royal couple shook hands with pupils.
Frankie Whitty, 12, said Charles had asked her about her homework.
"He asked me if I'd seen the new Harry Potter film," she said.
"But it hasn't come out yet."
The couple's tour of the US has so far included visits to Ground Zero in New York and to people affected by Hurricane Katrina in New Orleans.
In San Francisco they also toured the farmers' market before watching the popular Beach Blanket Babylon musical.