Step 1

Add the garlic, fish sauce, oyster sauce, brown sugar, black soy sauce, pepper, and sake into a large bowl. Whisk together until combined. Add the steak to the bowl and coat with the marinade. Set aside to marinate for 30 minutes.

Step 2

Make the pickled red onions. Mix together the water, rice wine vinegar, and sugar in a small bowl. Add half the red onion and set aside.

Step 3

Cook the steak after marinating for 30 minutes. First, heat a tablespoon of oil in a wok or large pan over high heat. Make sure it coats the entire bottom of the pan. Add in the steak.

Step 4

Cook the steak for about 1-3 minutes per side until you get a brown sear on all sides. You are aiming for medium rare to medium. You may cook for more or less time depending on how thick your steak is.

Step 5

Remove the steak from the heat. Add the rest of the onion to the pan and saute until soft (2-3 minutes).

Step 6

Once the steak is done cooking, serve over a bed of lettuce with pickled red onions and sliced tomatoes.