In a large bowl, cream the butter and sugar until light and fluffy. Add 1 egg at a time, beating well after each addition. Stir in coffee liqueur and vanilla. Combine the flour, chili pepper, baking soda, baking powder, cinnamon and salt; gradually add to creamed mixture and mix well. Stir in the pecans, chocolate chips and grated chocolate.
Divide dough in half. On an ungreased baking sheet, shape each half into a 10x2-in. rectangle. Bake at 350° for 20-25 minutes or until set and lightly browned.
Place pans on wire racks. When cool enough to handle, transfer to a cutting board; cut diagonally with a serrated knife into 3/4-in. slices. Place cut side down on ungreased baking sheets.
Bake for 8-10 minutes on each side or until golden brown. Remove to wire racks to cool completely. Store in an airtight container.