Add flour to a large bowl - add sugar, salt, butter and coconut oil (or shortening.) Using a pastry blender, cut fat into flour using a pastry blender until they are the size of large peas.
Whisk egg yolk and ice water (ice removed) together until very well mixed. Pour this into the bowl. Use a wooden spoon and mix gently until it starts to come together. Use your hands now to bring the dough together - pinching into a mass ball (your hands are warm, so do so quickly.)
Shape the dough into a round ball, flatten slightly. Wrap in waxed paper and place in a ziplock bag in the refrigerator. If using for a recipe immediately, let cool in the refrigerator, about 60 minutes until firm.
Notes
This recipe may not be reproduced without the consent of its author, Karen Sheer.