Add oil to the inner pot inside your Instant Pot. Set Instant Pot to saute function. Once oil is heated, add in steak and cook briefly to brown the exterior of the steak cubes (about 2 minutes). Turn off saute function.
In a medium bowl, add soy sauce, brown sugar, beef stock, gochujang paste, rice wine, garlic, ginger, sesame oil. Whisk until evenly mixed. Pour over beef. Seal your Instant Pot. Set it on manual mode, high pressure, for 10 minutes.
When Instant Pot is done, do a quick release (if you do a natural release, it will overcook the meat). While the Instant Pot is releasing, add cornstarch and water to a small bowl and mix until cornstarch is fully dissolved. When Instant Pot is safe to open, remove lid and stir meat a few times. Pour cornstarch water into potand immediately stir into the sauce. If you do not do this immediately, the cornstarch will cook and clump up. Set your Instant Pot on saute function again and stir until sauce has thickened (about 3 minutes). Garnish beef with scallions and sesame seeds. Serve with rice or similar rice substitute.
I used top sirloin steak but you can also try flank steak.
Gochujang paste is a spicy, savory and sweet fermented Korean sauce. It is usually available at most grocery stores, though there will be more brands available at Asian grocery stores.
You can taste the marinade and adjust as needed before adding it to the meat.
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The nutrition information provided are only estimates based on an online nutritional calculator. This is not a comprehensive list of all the nutrients in the recipe (i.e., does not include vitamins, cholesterol, etc). I am not a certified nutritionist. Please consult a nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.