In a big bowl, combine the ground beef, ground sausage, onion, garlic, parsley, bread crumbs, egg, wine, mustard, herbes de Provence, salt, and pepper; mix well.
Transfer mixture to a lightly oiled 9x5 inch loaf pan; gently pat down.
Bake until the loaf is firm and the top is lightly browned, about 1 hour.
Let stand in pan for 5-10 minutes before serving.
Remove loaf from pan; slice to serve; garnish with tomatoes and parsley sprigs.