To make the butter, put the pasilla chile peppers on a baking sheet and bake them until very brittle, about 15 minutes. When they are done, remove and cool them. Remove the seeds and crumble the chiles into a food processor. Add the butter and process until combined.
Lay out a sheet of plastic wrap on top of a sheet of foil. Turn the butter out onto the wrap and roll it into a cylinder. First wrap the plastic wrap around the cylinder and then secure the foil around it. Twist the ends, gradually applying more pressure as you twist, in order to make the cylinder taught. Alternatively, pile the butter into ramekins and cover with plastic wrap. Refrigerate it until firm. |