Black Bean and Chorizo Chili

Name: Black Bean and Chorizo Chili
Ingredients: 1 tablespoon cooking oil; 1 onion, chopped; 1/2 pound ground Mexican chorizo, casing removed; 1 pound ground beef; 3 cloves garlic, minced; 1 green bell pepper, chopped; 16 ounces can black beans, drained; 16 ounces can kidney beans, drained; 16 ounces can diced tomatoes (preferably fire-roasted); 16 ounces can tomato sauce; 2 hot chillies, minced (serrano, jalapeno, etc.); 1 tablespoon chili powder; 1 tablespoon dried oregano; 1 teaspoon cumin; 1 teaspoon coriander; 1/4 teaspoon salt; 1/4 can good beer (optional); cilantro, for garnish