Instructions
1Heat the olive oil in a large pot or deep skillet over medium. Cook the sliced onion 4–5 min until soft, then stir in the garlic for 30 seconds.
2Stir in the oregano and cumin and toast 30 seconds until fragrant. Add the tomatoes, chipotle + adobo, broth, and a good pinch of salt. Nestle in the chicken thighs, cover, and simmer 20–22 min until the chicken shreds easily (165°F).
3While the tinga simmers, make the salad: toss the avocado, cucumber, and red onion with the lime juice, salt, and pepper. Chill until dinner.
4Shred the chicken right in the pot with two forks and simmer uncovered 3–4 min so the sauce clings. Off heat, stir in a squeeze of lime juice to brighten. Taste for salt.
5Warm the tortillas in a dry skillet or directly over a low flame. Build tacos with tinga, crumbled queso fresco, cilantro, and a squeeze of lime, with the salad alongside.