¾ cup (180 ml) mezcal
½ cup (125 ml) fresh orange juice
¼ cup (60 ml) fresh lime juice
¼ cup + 1 tbsp (75 ml) grapeseed oil, divided, plus more for greasing grills
4 large cloves garlic, finely chopped
2 tbsp (30 ml) kosher salt, plus more as needed
1 tsp (5 ml) freshly ground black pepper
1 tbsp (15 ml) apple cider vinegar
2 tsp (10 ml) Worcestershire sauce
1 tsp (5 ml) smoked paprika
½ tsp (2.5 ml) ground cumin
16 green onions, divided
1 small white onion, thinly sliced
2 serrano peppers, stemmed and halved lengthwise
1 cup (250 ml) chopped fresh cilantro
1 flank steak, flap steak or skirt steak (about 2 lbs/900 g)
Tomatillo Salsa, make ahead, recipe follows
Tomatillo Salsa:
grapeseed oil, for greasing grills
8 oz (225 g) tomatillos (about 5 medium-sized), husks removed and rinsed under cold water
2 green onions, trimmed
1 serrano pepper
1 clove garlic
½ tsp (2.5 ml) kosher salt, plus more for seasoning
1 cup (250 ml) loosely packed fresh cilantro leaves and tender stems
1 tbsp (15 ml) fresh lime juice
2 avocados, peeled, pitted and roughly chopped