Sopa de tortilla
Sopa de tortilla, also called sopa azteca, is one of the best-loved soups of Mexico City's fondas: a brick-red broth of charred tomato, onion, garlic and dried pasilla chilli poured over crisp strips of fried corn tortilla. The strips soften at the edges and stay crunchy in the middle, and the toppings of avocado, fresh cheese, cream and fried chilli rings make each spoonful different. It is a starter in a comida corrida (set lunch) and a cure-all on a cold evening. We use a well-flavoured vegetable stock in place of chicken broth. Chef's tip: fry the blended tomato purée in hot oil until it darkens and smells sweet before adding the stock; this "seasoning" of the sauce is what makes Mexican soups taste deep rather than thin.



