Best Steak Marinade in Existence - soy sauce, olive oil, lemon juice, Worcestershire sauce, garlic, basil, pepper, cayenne, and parsley. I have to admit, this is hands-down the best steak marinade I’ve ever had. It is packed full of flavor and doesn’t use any crazy ingredients. Marinate all day for maximum flavor! Grill or pan sear for a meal that is better than any fancy steakhouse.