The first time our elder son seemed to understand food was at a McDonald’s. During a vacation, we had picked up a hamburger for him. He approached it with caution. First, he began to carefully dismantle it. He removed the pieces of onion, the ketchup, and the slice of pickle, then the wilted lettuce and the meat. The result was a soggy piece of bread with a slice of tomato that must have turned red from embarrassment. Thus was born the delicious “tomato sandwich,” still a fixture on our family menus.