Remove and discard stems and seeds from chiles. Pour boiling water over chiles in medium bowl; let stand 20 minutes or until chiles are softened. Drain chilies, reserving 1/2 cup of liquid. Place chiles, reserved 1/2 cup liquid, cornmeal and 1/2 teaspoon salt in food processor container. Cover; process until smooth. Set aside.
Coat beef with cumin. Heat 1 tablespoon oil in stockpot over medium heat until hot. Brown half of beef; remove from stockpot. Repeat with remaining oil and beef. Pour off drippings; return beef to stockpot. Add tomatoes and ancho chile mixture to stockpot. Bring to a boil. Reduce heat; cover tightly and simmer 1-1/2 hours.
Add sweet potatoes to stockpot; bring to a boil. Reduce heat; cover and continue cooking 25 to 30 minutes or until beef and sweet potatoes are fork-tender, stirring once.
Serve stew with toppings, as desired.
Servings 0