Created by KittenCal on March 25, 2012
Step 1: In a large bowl whisk/mix the first six ingredients together until well blended. Add in the ground beef with garlic, green onions, black pepper and salt; mix to combine. Shape the ground beef into 7-8 patties (about 1-inch thick). Place the shaped patties on a baking sheet; cover with plastic wrap and refrigerate for about 6 or more hours.
Step 2: Grill the burgers over medium-high heat, brushing with soy sauce while grilling. Grill for about 6 minutes per side. The last 4 minutes or grilling place the pineapple slices on the grill; lightly brown on both sides (about 2 minutes per side).
Step 3: Place a lettuce leaf on each crusty bun. Top with a grilled burger and then a slice of grilled pineapple.