Because this rub contains sugar, make sure to mind the grill and turn the pork often to keep the sugar from burning.
1 tablespoon fennel seeds
1 tablespoon cumin seeds
1 tablespoon coriander seeds
3/4 teaspoon ground cinnamon
1 1/2 teaspoons dry mustard
1 1/2 teaspoons brown sugar
Toast seeds in small skillet over medium heat, shaking pan occasionally to prevent burning, until fine wisps of smoke appear, 3 to 5 minutes. Cool to room temperature.
Combine cooled seeds with remaining ingredients, and grind mixture to powder in spice grinder.
Rub mixture over oiled and seasoned pork before grilling.
Makes about 1/4 cup.