mix the ground flaxseed and water (= egg replacer) and let it rest a few minutes
in a bowl mix flours, sugar, cream of tartar, baking soda, cocoa powder and a pinch of salt
add the vegan butter/margarine (at room temperature), the flax-egg and the liqueur
mix all the ingredients in the bowl with a spoon, then as crumbles start to form, move them on a board and knead the dough with your hand for a few minutes, until it becomes firm
shape it into a “ball”, cover it with plastic wrap and refrigerate for at least an hour
pre-heat the oven at 160°C / 320°F
grease the baking pan with some vegan butter/margarine
put the dough ball directly into the pan and spread it out with your hand, leaving the borders higher
bake for 25-30 minutes and once out of the oven, let the crust cool completely
carefully place the crust on the serving plate, spread some strawberry yogurt on it and decorate with fresh strawberries as you like