Carne Asada con Mojo (Grilled Beef with Sour Orange Marinade)

Ingredients

• 0.5 cup mexican lager beer such as modelo especial 
• 6 servings warm corn tortillas 
• 2  bay leaves dried
• 1 sprig rosemary fresh (6 in.)
• 5  garlic cloves minced
• 6 servings guacamole 
• 6 servings hot sauce such as tapatio brand, or salsa
• 2 teaspoons kosher salt 
• 3 tablespoons juice of lime 
• 0.3 cup olive oil 
• 0.5 cup orange juice freshly squeezed juiced (save 2 of the halves)
• 1.5 teaspoons mexican oregano crumbled
• 1.5 teaspoons pepper 
• 1 large onion red sliced into half moons cut in half lengthwise, then
• 2 pounds skirt steak 

Equipment

• baking pan
• grill
• aluminum foil
• tongs

Directions

1. Combine orange juice, beer, oil, lime juice, salt, pepper, oregano, garlic, bay leaves, and rosemary in a glass 9- by 13-in. baking dish.
2. Add orange halves, onion, and steak and mix with your hands to coat evenly.
3. Let stand at room temperature 1 hour, or chill, covered, 2 hours (no longer, or the citrus will "cook" the meat), turning meat occasionally.
4. Heat a grill to very high (550 to 650). Discard rosemary, bay leaves, and orange halves.
5. Drain meat and onions. Put onions on a doubled sheet of foil and turn up edges just a little to make a shallow 6- by 9-in. container.
6. Grill onions on the foil, stirring occasionally with tongs, until edges start to char, 8 to 10 minutes.
7. Add steak to grill and cook, turning once, until well browned and done the way you like, 8 minutes for medium-rare.
8. Transfer steak and onions to a board; slice steak.
9. Serve with tortillas, guacamole, and hot sauce.
10. *Warm directly on the grill just until hot, turning once; stack and wrap in a towel.