5 pounds bone-in, skin-on chicken pieces, scored 1/4" deep twice on each side (whole drums and thighs or half breast pieces)
1 cup yogurt
1 medium tomato, finely chopped (if no fresh tomatoes, you can use 1/3 cup well drained chopped canned tomatoes)
1/2 medium onion, finely chopped or grated
4 cloves garlic, finely chopped or grated
1.5-2 Tablespoons kosher salt
2 teaspoons sugar
the zest of 1 lime
1 Tablespoon lime juice
1/3-1/2 cup chopped cilantro
2 teaspoons achiote powder
1 teaspoon cumin
2 teaspoons dried Mexican oregano (the other kind will do in a pinch, of course)
2-4 minced Serrano chilies (JalapeƱos work as well)
3 Tablespoons oil
1 green onion, chopped, and a handful of chopped cilantro for garnish