In a small bowl, stir together oil, lime juice, cilantro, garlic, chili powder, cumin, salt, pepper and sugar. Drizzle all over the steak and using your hands, press into the steak. Let marinate for 30 minutes to 1 hour.
3 Tablespoons Olive Oil, 2 fresh Limes (juiced, about 2 Tablespoons), 1 to 2 teaspoons Chili Powder, 1 teaspoon Cumin Powder, 1 to 2 teaspoons Salt, Fresh Cilantro, 1 teaspoon Sugar