Melt butter in saucepan over low heat. Add onions and peppers, cook slowly until tender. Remove onions and peppers. Blend flour, salt, pepper, cayenne and mustard together. Stir into butter, add milk stirring constantly. Cook until sauce is smooth and thickened. Take off heat, fold in lemon juice, worchestershire, crab meat, 2/3 of cheese, sauteed veges. Place in a 2 quart casserole dish. Spread crumbs and remaining cheese around edge of dish. Heat at 325 for 15-20 minutes.
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