In the same skillet, brown the onions and bell pepper. Add oil, if needed. Add the tomato and garlic and cook for 1 minute. Season with salt and pepper. Return the meat to the skillet. Add the beer and chicken broth. Bring to a boil. Cover and bake for about 2 hours or until the meat is tender. Add the chorizo and cook, uncovered, for about 45 minutes, stirring occasionally. Adjust the seasoning.