Step 1Add together all dry ingredients. Fold in the butter and shortening. Mix until the dough looks somewhat sandy. Add egg and remaining wet ingredients. Stir, fold and need then wrap and chill for at least 2-4hours.
While dough is chills, peel and slice plantains. Add into a saucepan with one squeezed lime and a little water or favorite sauce . Cook until tender then remove and mash plantains, adding sugar, vanilla, nutmeg, and red food coloring (optional). Let it cool. Preheat oven to 350 degrees F (175 degrees C).
Roll dough into 1/4-inch thick, 4 or 5 inches round pieces, a cookie cutter can also be used. Add a tbsp of plantain filling into the center of each circle, then fold in half and Place the tarts on a baking sheet, brush with beaten egg white, and sprinkle with white or brown sugar.
Bake for 20 to 25 minutes or until golden brown. Allow tarts to cool to room temperature then dust a little convectional sugar (totally optional)