Pre-heat oven to 350 degrees. Combine pork, beef, ground cumin, garlic, eggs, bread crumbs, salt & pepper. Mix well. Shape into medium size meatballs. Bake for 10-15 minutes (or until firm enough to "stew").
While meatballs are in the oven, combine the chilies, 1/2 can of en adobo sauce, tomatoes, broth, garlic, cumin seeds, oregano and lard in a blender. Puree until smooth.
In a large pot, bring sauce to a boil. Add meatballs and simmer for 25 minutes.