2 lbs Laura's Lean 93% ground beef
1/2 cup grated carrots
1/2 cup chopped scallions
1 tsp fresh grated ginger
1 tbsp reduced sodium soy sauce
1 tsp sriracha sauce (or more if you like it spicy)
8 slices fresh pineapple
8 whole wheat 100 calorie buns (I used Martin's)
8 lettuce leaves

For the pineapple teriyaki sauce:

1/2 tbsp cornstarch
1/4 cup cold water
1/4 cup low sodium soy sauce
1/2 cup pineapple juice
3 tbsp brown sugar
1/2 teaspoon fresh grated ginger, very fine
1 small garlic clove, minced