Azteca (Aztec-inspired Bean Soup)

Ingredients

• 1 can (~2 cups) corn
• 1 can (~2 cups) kidney beans
• 1 can (~2 cups) black beans
• ½ onion, finely minced
• 4 cloves garlic, finely minced
• 6 dried pequin chiles, chopped
• Mustard seed, salt, and freshly-ground black pepper, to taste

Instructions