Instructions: Cactus looks forbidding. Stripped of its prickly points, however, it is a mild-mannered vegetable with a slightly tart flavor. Look for easy-to-use canned cactus (sold as NOPALES or NOPALITOS) in supermarkets and Mexican groceries. = =
* - husks removed, rinsed and coarsely chopped
** - packed in water, drained and rinsed.

In a 4-5 quart pan over medium heat, stir oil and onion often until onion is golden, about 15 minutes. Add tomatillos; stir often just until soft, about 6 minutes. Add broth; bring to a boil over high heat. Stir in cactus, lime juice, and cilantro. Cook until hot. Ladle soup into a tureen. Offer cheese to add to taste. Accompany with lime wedges.

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