Combine mayonnaise, tomato sauce, Worcestershire sauce, lemon juice, 1 1/2 tablespoons of the chives and Tabasco sauce in a bowl. Taste and season with salt and pepper.
Spoon half the mayonnaise mixture among lettuce leaves. Top with prawns and drizzle with remaining mayonnaise mixture. Sprinkle with the remaining chives. Place on a serving platter and serve immediately.