Place a pan on high heat and add the beef, cut into shawarma-style strips. Use any tender cut of beef that doesn't require much cooking time.

Marinate the beef with the mentioned marinade ingredients, vinegar, and oil, and let it sit overnight or for 6 hours.

The beef will release its juices and then reabsorb them. Sauté until it's 3/4 cooked, then add the julienned onions until they soften and cook. Add the bell peppers and cook, then add the tomatoes and stir for 2 minutes.

Add the parsley and stir for 1 minute. Serve in hoagie rolls or pita bread alongside tahini salad and pickles.