Range Rider Stew

1/2 pound green cooking apples
3 tablespoons butter, divided
1/4 pound onions, sliced into rings
3 pounds potatoes, cooked and sliced
3/4 pound beef, already cooked and diced
Salt
Dash nutmeg
Pepper
3 cups gravy
1/2 cup bread crumbs

Add onion rings to 3 tablespoons melted butter and brown; remove onion rings. Melt remaining butter and saut