SHREDDED BEEF IN GUAJILLO SAUCE (CARNE DESHEBRADA EN SALSA ROJA )

Steps:

• Cook beef:
• Put all beef ingredients in a 5- to 6-quart heavy pot with 1 teaspoon salt and enough water (about 2 quarts) to cover beef. Simmer, partially covered, skimming foam and adding more hot water if necessary to keep beef covered, until tender, about 2 hours.
• Remove beef and shred (once cool).
• Strain broth through a fine-mesh sieve into a bowl, discarding solids, and skim off fat.
• Make sauce:
• Preheat broiler.
• Toss tomatoes with 1 tablespoons oil in a 4-sided sheet pan. Broil 3 to 4 inches from heat until softened and charred, 10 to 12 minutes.
• Slit guajillo chiles lengthwise, then stem and seed. Heat a dry heavy medium skillet (not nonstick) over medium heat until hot, then toast chiles in 2 batches, opened flat, turning and pressing with tongs, until more pliable and slightly changed in color, about 30 seconds per batch. Transfer to a bowl and soak in hot water to cover until softened, 20 to 30 minutes.
• Toast peppercorns, cumin seeds, allspice, and clove in hot skillet over medium heat, stirring constantly, until fragrant and a shade darker, 30 seconds to 1 minute. Transfer to a blender.
• Drain soaked chiles and purée in blender with toasted spices, broiled tomatoes, onion, garlic, 3 chiles de árbol, 2 cups broth, and 1 teaspoon salt until smooth, about 2 minutes. For a spicier sauce, add remaining 2 chiles de árbol and purée again.
• Heat remaining 2 tablespoons oil in cleaned pot over medium-high heat until it shimmers, then slowly add sauce, stirring (it will spatter), and simmer, stirring frequently, 5 minutes. Add beef and 1 cup broth (reserve remainder for another use) and cook over medium-low heat, stirring, until meat is heated through, about 5 minutes.