Season cubed sirloin with salt and pepper, then sprinkle flour and toss to coat beef.
Heat pressure cooker to saute, add a couple tablespoons of oil, and when hot sear beef on all sides to brown - you’ll need to do this in batches - remove and set aside.
Add a little more oil, then the onions and garlic, and after a couple minutes the carrots & celery.
Give them a couple minutes to soften, then add the tomato paste, and stir in well.
Continue with the vermouth, allowing a couple minutes for it to reduce, then add the broth and thyme, stir and loosen the 'fond'.
Add seared beef (and all its juices), potatoes, mushrooms and soy.
Stir well, put on lid, set to high pressure and cook for 25 minutes.
Let steam release by itself for 10 minutes, then release the rest.
Mix cornstarch with a couple tablespoons of water until smooth, then stir into pot and let thicken a couple minutes.
Serve with chopped parsley.
