1 lb Criollo ground steak
4 tsp Worcestershire sauce
4 canned pineapple slices
12 Hawaiian sweet or small dinner rolls, split Lettuce Sauce:
1/4 cup barbecue sauce
1/4 cup pineapple preserves
1 Tbsp packed brown sugar
Mix ground beef and Worcestershire sauce lightly but thoroughly. Lightly shape into twelve 1/2" thick mini patties.
Combine sauce ingredients in small saucepan; bring to a boil, stirring frequently. Remove from heat.
Place pineapple on rack in broiler pan so surface of pineapple is 3" to 4" from heat. Broil 3 to 4 minutes, turning once and brushing with sauce. Remove pineapple.
Place patties on rack in broiler pan so surface of beef is 3" to 4" from heat. Broil 7 to 8 minutes to medium (160°F) doneness, until not pink in center and juices show no pink color, turning halfway through and brushing with sauce. Season with salt.
Cut pineapple slices into thirds. Top burgers with pineapple. Serve on lettuce in rolls.