Lobster Club Sandwich

Name: Lobster Club Sandwich
Ingredients: 3 slices walnut bread (7 1/2 x 3 x 1/4 inches); 1 ounce good mayonnaise; 2 1/2 ounces butter; 3 ounces lobster meat, cooked; 1/4 ounce wild arugula; Spago House Balsamic Dressing (recipe follows); 2 slices vine-ripened or heirloom tomatoes; Salt and black pepper; 2 slices applewood-smoked bacon, crisped; 2 caperberries; 1 tablespoon balsamic vinegar; 2 teaspoons sugar; 1/4 teaspoon kosher salt; Pinch freshly cracked black pepper; 1 tablespoon sherry vinegar; 1/4 cup Tuscan olive oil