Buffalo Meat Loaf

Name: Buffalo Meat Loaf
Ingredients: 1 cup chopped onion; 2 celery ribs, cut into 1/4-inch dice; 1 carrot, cut into 1/4-inch dice; 1 tablespoon chopped garlic; 3 teaspoons vegetable oil; 3/4 cup fine fresh bread crumbs; 1/2 cup chopped fresh flat-leaf parsley; 1 large egg; 2 tablespoons ketchup; 1 tablespoon Worcestershire sauce; 2 teaspoons salt; 1/4 teaspoon freshly ground black pepper; 1 3/4 lb ground buffalo; 6 shallots, cut into 1/3-inch wedges; 6 plum tomatoes, each cut into 6 wedges; 1/3 cup water