This video introduces a recipe for buttery shortbread with a gentle, crispy texture, made with just four basic ingredients. First, mix together room-temperature unsalted butter and powdered sugar, then sift in cake flour and rock salt. Gather the dough into a ball, let it rest in the refrigerator, then roll it out to a thickness of 5mm with a rolling pin and cut out shapes with your favorite cookie cutters. Chill the cut-out dough again in the refrigerator to firm it up, then bake it in the oven to complete the fragrant butter cookies. They are delicious fresh out of the oven, but the butter flavor will meld together more and develop a deeper taste if you let them sit for a day or two. Cut-out cookies are recommended for those who are not good at shaping dough.