2) In saucepan saute onions, green peppers, and celery in butter until vegetables are soft but not browned. Stir in flour, mustard, salt, and milk; cook over medium heat, stirrring constantly, until sauce thickens.
3) Add worcestershire sauce, pimento, shrimp, and olives to saucepan; simmer until heated thoroughly.
4) Spoon shrimp mixture into 4 ramekins; top with bread crumbs. Bake for 15 minutes, or until browned and bubbly. Remove from oven, and serve hot.