1. Preheat over to 350°F.
  2. Spray a 9 by 11 inch pyrex dish with a non stick spray.
  3. Sprinkle brown sugar on bottom.
  4. Break the bread in cubes on top of that.
  5. In a large bowl whisk the eggs, milks, sugar, vanilla.
  6. Pour over the bread.
  7. Add a few raisins if you like.
  8. Cut the stick of margarine into pieces and place all over the top of pudding.
  9. Bake in the preheated 350°F oven for 40 to 45 minutes.
  10. While baking, I melt another stick of margarine in a heavy saucepan, add ½ cup flour and make a paste, add 1 cup evaporated milk and ½ cup water and bring to a boil, whisking as you go.
  11. As it thickens add 1 tsp vanilla and ¼ tsp salt.
  12. Continue to cook lowering heat and whisking until it is "very" smooth.
  13. Serve over each bowl of bread pudding.
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