Ricotta-and-Parsley-Filled Tortelloni with a Pink Tomato Sauce

When my daughter Gabriella was four years old, we invited her preschool class over for a cooking class. Although I am quite comfortable teaching adults, I was a little concerned about holding the attention of a group of four-year-olds. I decided, in the words of Ms. Frizzle of The Magic School Bus, to take chances, make mistakes, and get messy by having everyone make pasta. Well, we did get a little messy, and some mistakes were made, but in the end a lunch of delici