2In medium size pan, melt margarine or butter, mix in flour. Slowly add milk, stirring constantly, to keep mixture smooth and free from lumps. Cook, stirring over medium heat until mixture comes to a boil and thickens. Mix in onion, Worcestershire sauce and bread cubes. Cool.
3Fold in mayonnaise, lemon juice, salt and pepper.
4In another pan, melt butter until lightly browned. Add crabmeat and toss lightly. Combine with sauce mixture.
5Put into individual shells or ramekins (or greased 1-qt. casserole). Sprinkle paprika over top. Bake at 450 degrees until hot and bubbly and lightly browned on top, 10-15 minutes.