Start by slicing the beef (or chicken/tofu) thinly, if not pre-sliced. Chop the green onions into two-inch pieces for a vibrant garnish later.

Coat the sliced beef with cornstarch and let it sit for about 10 minutes.

In a medium bowl, combine soy sauce, brown sugar, and optional hoisin sauce. Whisk until smooth.

Heat a skillet over medium-high heat and add oil. Sauté minced garlic and freshly grated ginger until fragrant.

Add the marinated beef in a single layer to the skillet. Cook for 2-3 minutes without stirring, then flip and cook through.

Pour the prepared sauce over the beef and add the green onions. Stir well and cook for an additional 3-5 minutes.

Enjoy your Sizzling Mongolian hot over rice or noodles.