Chef Lupi's Cocoa Shortbread Pastry

Shortcrust pastry is a mixture of flour (usually with a fairly low planning factor) and other ingredients such as salt, sugar, butter, eggs, baking soda, and flavorings (such as vanilla, vanillin, or the zest of a citrus fruit) worked to a consistency that is usually quite firm, which can vary depending on the recipe and the amount of ingredients that will be added and the use to which they will be put. Here is a recipe with cocoa.