Stuffed Green Peppers

3 large green peppers
1/2 pound ground beef
1 cup dry bread crumbs
1 tablespoon chopped onion
1 teaspoon salt
1/4 teaspoon pepper
1 can (8 ounces) tomato sauce

Heat oven to 350 degrees. 
Cut thin slice from stem end of each pepper.
 Remove all seeds and membranes. 
Wash inside and outside. 
Heat 1 cup water and 1/2 teaspoon salt to boiling. 
Add peppers; cook 5 minutes and drain.
Mix remaining ingredients. 
Lightly stuff each pepper with 1/3 of the meat mixture. 
Stand peppers upright in ungreased baking dish, 8 x 8 x 2 inches. 
Cover; bake 45 minutes. 
Uncover; bake 15 minutes longer.