-frozen) In bowl, stir lemon juice into milk. Let stand 1 minute to sour. Stir in egg, oil and molasses. In large bowl, combine bran, whole wheat and all-purpose flours, sugar, lemon rind, baking powder and baking soda. Add milk mixture and blueberries, mixing just until combined. Spoon into non-stick or paper-lined muffin tins. Bake in 375 degree F oven for 20 to 25 minutes or until firm to the touch. Makes 12 muffins. Per muffin: 159 calories, 6 grams total fat (1 gram saturated), 3 grams fibre.