In a large mixing bowl stir together egg, oats, onion, green pepper, and salt.
Add beef and pineapple; mix well.
Divide mixture into 6 equal portions.
Shape each portion into a 4x2 inch loaf.
Place loaves in a 13x9x2 inch pan.
Bake, uncovered, in a 350° oven for 30 to 35 minutes or till meat is no longer pink.
Top each loaf with 1 teaspoon of the sweet and sour or barbecue sauce, if desired.