1 lb. ground beef
1 tsp. salt
4 canned pineapple slices, drained
4 tbsp. brown sugar
4 tbsp. catsup
4 tsp. mustard

Shape meat into 8 thin patties. Sprinkle with salt. Put 1 slice of pineapple on each of 4 patties. Top with remaining 4 patties and seal edges. Put burgers on broiler pan rack. Broil with tops 4" from heat until brown, 3 to 5 minutes.
Mix brown sugar, catsup and mustard. Turn burgers. Spoon brown sugar mixture on burgers and broil until done, approximately 3 to 5 minutes. Very surprising and delicious taste.