The Best Carne Asada Tacos, Marinated in Cerveza

Name: The Best Carne Asada Tacos, Marinated in Cerveza
Prep time: 6 h
Cook time: 20 min
Total time: 6 h 20 min
Cuisine: Mexican
Ingredients: 2 lbs flank or skirt steak; 2 oranges, large, juiced; 5 limes, juiced; 4 to 6 cloves garlic, crushed; 1 white or yellow onion, small, sliced; 1 serrano, small, finely diced and seeded; 1/2 can beer (Anjie recommends using Mexican beer); 1 bunch cilantro, chopped; 1 1/2 tsp oregano; 1 tsp paprika; 1 Tbsp salt (more or less to taste); 1 1/2 tsp sugar; 1/4 tsp cumin; 1/8 cup olive oil; onion, chopped; cilantro, chopped; lime, sliced