Carne Asada Clásica

Name: Carne Asada Clásica
Ingredients: 3/4 cup (6 ounces) dark Mexican ale; 1/2 cup fresh orange juice; 1/4 cup fresh lime juice; 1/4 cup plus 1 tablespoon grapeseed oil , divided; 6 medium garlic cloves , finely chopped (about 2 tablespoons); 2 tablespoons plus 1/8 teaspoon fine sea salt , divided; 1 tablespoon apple cider vinegar; 2 1/2 teaspoons Worcestershire sauce; 1 teaspoon black pepper; 1/2 teaspoon Mexican oregano; 1/2 teaspoon smoked paprika; 1/4 teaspoon ground cumin; 1/8 teaspoon ground cloves; 10 spring onions or 15 scallions, divided; 2 pounds flap steak , patted dry (See Note); 1 small white onion , thinly sliced (about 1 3/4 cups); 2 serrano chiles , stemmed and halved lengthwise; 1 cup chopped fresh cilantro; Warm tortillas and salsa, for serving