Combine all ingredients well in a small mixing bowl. Refrigerate any extra rub in a airtight container.
1 cup dark brown sugar, 1/2 cup paprika, 1/4 cup garlic powder, 2 tablespoons black pepper, 2 tablespoons onion powder, 2 teaspoons mustard powder, 2 teaspoons juniper berries, ½ teaspoon cayenne, 2 teaspoons allspice