Begin by placing all the base ingredients (flour, butter, sugar, ground almonds/almond meal, zest & extract), into a food processor and blend until resembling breadcrumbs. Does not need to be all the same size of pieces, but is ready if, when you use your hands, you are able to bring it together into a large piece without it crumbling. You might need to knead ever so lightly with your hands to get it to come together. Using your hands is more gentle than using the processor, as by hand the ground almonds and butter will combine with the dry ingredients and give off moisture. You can also do this by using a pastry cutter/pastry blender, or 2 butter knives. See Photo 1 below.