Chopped white onion: Adds a slightly pungent and crunchy element to the soup. Diced jalapeños or serrano peppers: For those who prefer an extra kick of spiciness, adding chopped fresh jalapeños or serrano peppers can enhance the soup's heat. Crema or sour cream: Drizzling a spoonful of Mexican crema or sour cream on top of the soup can add a creamy and tangy contrast to the dish. Chopped fresh tomatoes: For a burst of freshness and acidity, you can add some chopped fresh tomatoes to the soup.