• Preheat oven to 400 degrees F.
• At a low heat in a small saucepan place 1/2 slice of crustless, white bread and 3 tablespoons milk. Cook gently until bread has absorbed milk. Mash to a pulp and allow to cool.
• Place 1 1/2 pounds ground beef into a bowl with the bread pulp and 1 beaten egg. Season with salt and pepper. Mix well and form 6 patties. Sprinkle 2/3 cup dry breadcrumbs on a plate and dredge patties thoroughly.
• Heat 1/4 inch vegetable oil in a large frying pan and fry patties 2 minutes on each side until brown. Transfer to a greased, ovenproof dish in a single layer.
• Slice 2 large beefsteak tomatoes, and lay a slice on each patty. Sprinkle with 1 tablespoon chopped fresh oregano, salt, and pepper. Cut one mozzarella cheese into 6 slices and put a slice on top of each tomato.
• Cut 6 drained, canned anchovies in half. Make a cross on top of each mozzarella slice with anchovy halves. (If you don’t like anchovies, use slices of sun-dried tomatoes or dot cheese with pesto. You could even form the crosses with strips of long green chiles that have been grilled and peeled.)
• Bake 10 to 15 minutes until cheese is melted. (If you want to, place the hamburgers on top of toast rounds drizzled with garlic olive oil and grilled.) Serve hot. Then enjoy your “slow food” Italian hamburger.