Mexican Tortilla Soup

Cut raw kernels off corn cob with a sharp knife.

In a large saucepan, melt the butter over moderate heat.

Add the garlic, onion, celery, corn, carrots and chili and cook for 3 minutes, stirring occasionally, until the onion is translucent.

Stir in the cumin, chili powder and oregano and continue stirring another minute to toast the spices.

Add the tomatoes, stock, cilantro and chicken.

Bring mixture to a boil and simmer for 10 minutes. Season with salt and pepper.