I first tried a version of these snacks at Marc Vetri’s restaurant Cucina Vetri in Philadelphia and was struck by how simple yet perfect they were. Thinly sliced and lightly caramelized around the edges, with some melty cheese on top and a little red pepper kick, the vegetable becomes an elegant treat. I call these “frico” because they recall those lacy baked Parmesan cheese rounds, though they aren’t as crisp. Serve them with cocktails.