Whisk the sauce ingredients together in a bowl, and set aside for later.
Put 2 tablespoons of ghee in a large skillet over medium-high heat. While your skillet warms up, pat dry your strips of steak and then toss them with 2 tablespoons of potato starch. Place the coated steak into the hot ghee and cook until browned and almost crispy. This takes about 5 minutes. Take the steak out of the pan and set aside for later.
In the same skillet, warm another 2 tablespoons of ghee over medium heat, and add the onion, peppers, broccoli, and sugar peas from above. Cook the veggies over medium heat for a few minutes, until bright in color and still bite tender.
Add the cooked beef and the sauce into the skillet with the veggies, and simmer until the sauce thickens and the veggies are cooked to your liking, about 5 minutes or so. The sauce is plenty seasoned, but you can season to your taste if you wish.