Step 1

Preheat broiler with oven rack 8 to 10 inches from heat. Stir together mayonnaise, chopped basil, lemon juice, orange zest, orange juice, and Old Bay in a medium bowl. Fold in shrimp, bacon, salt, and pepper.

Step 2

Split slider buns, and spread butter evenly on cut sides of buns. Place halves, butter side up, on a baking sheet; broil until light golden brown, about 3 minutes. Spoon about 1/4 cup shrimp mixture on each bottom half; top each with 3 basil leaves and 1 or 2 tomato slices. Cover with top slider bun halves, and serve immediately.