4 mirliton or choyote squash 1 stick of butter 1 onion, finely chopped 1 Pound of peeled shrimp, chopped 1 Pound of claw crabmeat 2 tablespoons diced ham 1 cup seasoned bread crumbs 1 bunch thinly sliced green onions Salt and pepper to taste Additional bread crumbs and butter for topping