Put beef cubes in a container with a lid. Whisk 2 tablespoons olive oil, 2 tablespoons oyster sauce, 4 minced garlic cloves, wine, 1 teaspoon fish sauce, 1 teaspoon black pepper, soy sauce, dark soy sauce, and sesame oil together in a bowl until marinade is well mixed; pour over beef. Allow beef to marinate for 10 to 30 minutes.

Whisk 1 tablespoon fish sauce, lemon juice, and 1 tablespoon black pepper together in a bowl until dipping sauce is well mixed.

Heat 2 tablespoons olive oil in a wok or large skillet over high heat; add beef and marinade. Cook and stir beef mixture with 2 tablespoons oyster sauce and 4 cloves of minced garlic in hot oil until beef is cooked through and sauce begins to thicken, 5 to 10 minutes.