Easy Instant Pot Mongolian Beef This Easy Instant Pot Mongolian Beef recipe is delicious. Even with the time to build pressure in the Instant Pot it was dinner in 30-minutes. The meat is tender and full of flavor. 4 1-1/2 pound Flank Steak or Flat Iron Steak 3/4 cup soy sauce 1/2 cup brown sugar 1/4 cup water 1/2 teaspoon fresh ginger minced 1 garlic clove, minced 1 carrot shredded 1 tablespoon Olive Oil 1 green onion, sliced (for garnish) 3 Tablespoons cornstarch 3 Tablespoons water