What is transparent pie, and do you have a recipe for it? —S.J., Anaheim, CaliforniaTransparent pie is popular in the South and has a glossy sweet filling based on brown sugar, molasses, corn or maple syrup. Pecan pie is a good example. Transparent pie is typically thickened with egg and can include tart jellies, lemon or vinegar to cut the sweetness. Cream, butter, spices, nuts or dried fruits are often added as well.