Grilled Lobster and Avocado Cocktail

INGREDIENTS

• Salt and freshly ground pepper
• 2 teaspoons honey
• 1/4 cup chopped watercress
• 2 (1 1/2-pound) lobsters, par-boiled and halved lengthwise
• 1 ripe avocado, peeled, pitted, and chopped
• 4 lime wedges, for garnish
• 1 tablespoon chopped fresh tarragon leaves
• 1/2 cup fresh lime juice
• 1 tablespoon extra-virgin olive oil
• 1 tablespoon Worcestershire sauce
• 1 teaspoon hot sauce (recommended: Tabasco)
• 2 tablespoons prepared horseradish, drained