Preheat the oven to 350 degrees F. Line a baking sheet with parchment paper.
Into a bowl, sift together the flour, cayenne, and salt.
In another bowl, cream together the butter and cheese. Add the dry ingredients and mix together. Fold in the pecans and sesame seeds. Drop onto the baking sheet 1 teaspoon at a time, spreading gently to flatten into rounds. Bake until golden and crisp around the edges, about 15 minutes.
Remove from the oven and let cool slightly before serving, or serve at room temperature.
Yield: about 1 dozen