Baked Red Snapper

One 3 pound red snapper
1 garlic clove
1 teaspoon of salt
1/4 teaspoon of pepper
1/3 cup of bacon fat, olive oil, melted butter or margarine
1 tablespoon of fresh lemon juice
2 onions, chopped
4 celery stalks, chopped
1/2 green pepper, chopped
2 tablespoons of chopped parsley
1/2 teaspoon of sugar
2 cups of fresh or canned tomatoes
1/4 teaspoon of crumbled thyme
1 bay leaf
Worcestershire sauce