Grab a big mixing bowl and whisk together olive oil, soy sauce, red wine vinegar, Worcestershire sauce, lemon juice, garlic, brown sugar, paprika, onion powder, and oregano. This marinade’s gonna be the flavor base for your kabobs.
Toss the top sirloin steak cubes into the marinade. You gotta make sure every piece is coated nice and good. Let it sit for at least 30 minutes but if you got time, 2 hours in the fridge works wonders.
While your steak soaks up the marinade, prep your pressure cooker pot. You want it ready to go with a cup of water or beef broth for broth depth.
Thread steak cubes, bell peppers, mushrooms, and onion alternately onto the skewers. Leave a little space between pieces so steam can move around and cook perfectly.
Place the skewers in the pressure cooker on a trivet if you got one, so the kabobs don’t sit in the liquid. Seal that lid tight and set your cooker to high pressure for 8 minutes.
Once the time’s up, do a natural release for 5 minutes. Then slide into quick release to let out the rest of the steam. Open the lid carefully and you’ll spot perfectly cooked kabobs, tender and packed with flavor. Rest a few minutes before digging in.