If buying fresh lamb, make a double batch and freeze half on the skewers. Convenience and compromise are cousins: Lamb is a meat that freezes very well. Make sure to transfer meat from the freezer to the refrigerator the day before you plan to serve it to ensure even thawing. To toast the red pepper flakes: Put red pepper flakes in a skillet and heat over medium heat just until flakes begin to brown. Immediately remove from heat and pour onto a cool dish to prevent burning.