1 1/2 lb. ground beef
1/2 c. chopped onion
1 (6 oz.) can tomato paste
4 oz. can mushroom stems & pieces, undrained
1-1 1/2 tsp. oregano
1 1/4 tsp. salt
1/2 tsp. pepper
1 c. shredded mozzarella cheese
1 tomato
1 can Pillsbury buttermilk biscuits

Brown ground beef and onion; drain. Stir in tomato paste, mushrooms, oregano, salt and pepper; simmer. Press biscuits into greased 9 inch pie pan to form crust.

Spoon meat mixture into crust. Slice tomato; arrange atop pie. Sprinkle with cheese. Bake in 350 degree oven for 20-25 minutes. Let stand 5 minutes before slicing.