Mexican Hominy Corn Soup

Name: Mexican Hominy Corn Soup
Cuisine: Mexican, Latin American, American
Ingredients: 500g pork shoulder, cut into cubes; 1 white onion, halved; 4 cloves garlic, peeled; 1 bay leaf; 1 tsp dried oregano; 1 tsp ground cumin; 1/2 tsp ground black pepper; 1 tsp salt, plus more to taste; 1 dried ancho chili, deseeded and rehydrated; 1 dried guajillo chili, deseeded and rehydrated; 1 can (800g) hominy, drained and rinsed; 1 tbsp vegetable oil; 4 cups water or chicken broth; Fresh toppings shredded lettuce, radishes, lime wedges, chopped onion, cilantro, and chili powder