Preheat oven to 400° F. Place two drained oysters on the deep half of one shell. Arrange filled oyster shells on a layer of rock salt in one large baking pan or six individual shallow casseroles. In a skillet cook the bacon until crisp, remove from pan, drain and crumble. To the bacon fat add the onion, green pepper and celery and cook until almost tender. Season with lemon juice, Worcestershire sauce and Tabasco. Spoon the mixture on the oysters in the shells and top with the crumbled bacon. Bake 10 minutes.