Step 1Heat the oven to 350 degrees. In a bowl, combine the mayonnaise, cilantro, mustard, lime juice, Worcestershire, Tabasco and cayenne. Mix well.
Step 2Stir in the green onions and piquillos. Add the crab and toss to mix well. Taste and adjust the seasoning, adding more of any flavoring if you like and salt and pepper to taste.
Step 3Divide the crab mixture among 4 small gratin dishes. Sprinkle evenly with the bread crumbs. Drizzle evenly with the melted butter. Bake 18 to 20 minutes, until the topping is crisp and lightly browned and the crab mixture is almost bubbly.