To the stock pot, add in the drained beans, diced tomatoes, tomato paste, and beef stock. Season with chili powder, Worcestershire sauce, garlic, oregano, cumin, basil, salt, pepper, and paprika. Stir to blend, then cover and simmer over low heat for at least 2 hours, stirring occasionally.
2 15 oz cans kidney beans, 1 15 oz can pinto beans, 1 15 oz can black beans, 2 28 oz cans diced tomatoes with juice, 1 6 oz can tomato paste, 2 cups beef stock, 3 tablespoons chili powder, 1 tablespoon Worcestershire sauce, 1 tablespoon minced garlic, 1 tablespoon dried oregano, 2 teaspoons ground cumin, 1 teaspoon dried basil, 1 teaspoon salt, 1 teaspoon ground black pepper, 1 teaspoon paprika