Preheat oven to 450°F. Line baking sheet with parchment paper. In a small bowl, mix lemon juice and coconut milk. Set aside. Mix together dry ingredients, then add 1/2 cup shortening to form coarse meal. Gradually mix-in the milk mixture to form a pliable dough. If dough becomes sticky you have added too much. Knead in remaining shortening 3tbsp at a time. Do not overwork. Roll out about 1" thick and cut 2" circles using cookie cutters or a glass. Bake 16min.