Place the chicken, onions, celery, tomatoes, parsley, and peppercorns in a stockpot and simmer until the chicken is cooked.
Soak fresh bread crumbs in milk, then mix with veal, half of pecorino pepato, garlic, parsley, salt, pepper, and 1 egg to make croquettes.
Cook meat mixtures, prepare rice, and layer the ingredients in a baking dish with bread crumbs, rice, meats, cheeses, and eggs.
Bake the assembled dish until golden brown on top.
Serve the Sicilian Christmas Tummala directly from the baking dish or with tomato sauce.
