We had a field trip today, but Mikel had requested Mini Pizzas (he was supposed to cook, but was feeling under the weather). So... I melted the cheezes (Follow Tour Heart and Daiya, both Mozzarella style), on the stove, and put them in a thermos. Then I heated up the pasta sauce and put that in a thermos as well. I toasted English muffins, sauteed some pepperoni-style Yves, sliced some onions and olives, and voila! - lunch was ready to go. The kids loved it!