Mario Batali: Skirt Steak Asada Tacos
2 medium poblano peppers, cored, seeded and cut into thin strips
4 cloves garlic, coarsely chopped
1 tablespoon chili powder
1 teaspoon ground cumin
6 canned plum tomatoes, drained
1 teaspoon salt, plus more for grilling
2 pounds skirt steak
1 medium red onion, finely chopped
1 bunch cilantro, picked to yield 1 cup
1/4 cup freshly squeezed lime juice (2 to 3 limes)
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