1. In a large bowl, mix together the flour, lecithin, ground flaxseeds, cream of tartar, baking soda, cinnamon, salt, and nutmeg. Stir in the soy milk, corn oil, liquid stevia, and blackberry extract, if you are using it, being careful not to overmix. Stir in the blackberries and walnuts, being careful not to overmix.
2. Drop a few tablespoons of the batter onto a hot, oiled griddle and spread the batter into a circle. Cook each pancake until it is lightly browned underneath, and then flip it over with a metal spatula, and cook the other side until it is browned. Repeat until you've used up all the batter.