How to Make It
Preheat grill to 500 °F.
Mix the fish base, lemon juice, basil, and garlic in a medium sized mixing bowl. Add the shrimp and toss to combine.
Mix the tomatoes, red onion, olive oil, basil, and black pepper in a small bowl. Set aside.
Remove the shrimp from the marinade and place directly onto the grill. Grill each shrimp for 2 minutes per side.
Top each slice of bread with 2 tablespoons of the tomato mixture and top with 2 - 3 shrimp. Serve immediately.