This old-style slump defies precise definition. It can serve as a one-pot vegetarian meal or as a side dish with fried chicken, veal, or white sausage, or it can be eaten alone as a dessert.
Preheat the oven to 375°F (190°C). Grease the interior of a large earthenware baking dish. Combine the peaches, tomatoes, almonds, prunes, and lemon zest in a deep bowl. Mix the Picoso Sugar, white sugar, and potato starch together, then stir into the fruit. Add the lime juice and sage