from smitten kitchen, http://smittenkitchen.com/2008/02/spicy-sweet-potato-wedges-plus-five-etceteras/
“Roasted Spiced Sweet Potatoes
Adapted from Gourmet, January 2002
Makes 4 to 6 servings.
1 teaspoon coriander seeds
1/2 teaspoon fennel seeds
1/2 teaspoon dried oregano
1/4 to 1/2 teaspoon dried hot red pepper flakes (the latter will make them quite spicy, so using according to your preferences)
1 teaspoon kosher salt
2 pounds medium sweet potatoes
3 tablespoons vegetable oil
Preheat oven to 425°F. Coarsely grind coriander, fennel, oregano, and red pepper flakes in an electric coffee/spice grinder or with a mortar and pestle. Stir together spices and salt.
Cut potatoes lengthwise into 1-inch wedges. Toss wedges with oil and spices in a large roasting pan and roast in middle of oven 20 minutes. Turn wedges over with a spatula and roast until tender and slightly golden, 15 to 20 minutes more.”