For this story, I visited a factory, a kind of factory I'd never seen before. I got suited up in safety gear -- smock, rubber gloves, a hair net -- not to protect me, but to protect the product made here. It's in almost every convenience store, college dorm, school cafeteria, and in thousands of family freezers around the country: the frozen burrito. I went to Dinuba, in the Central Valley, to meet the family behind the biggest business in frozen Mexican food.