1 pie crust, uncooked

Mix the following in another dish and then add to pie crust:

1/2 c. milk
1/4 c. chopped onion
1/4 c. ketchup
Salt and pepper to taste
Pinch of oregano
1 lb. lean hamburger

After putting in pie crust, cover with 1 cup shredded sharp cheese. Bake for 35 to 40 minutes in a 375 degree oven.