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Prepare Pressure Cooker: Heat up your pressure cooker over medium high heat (Instant Pot: press Sauté button and click the adjust button to go to Sauté More function). Make sure your pot is as hot as it can be (Instant Pot: wait until the indicator says HOT).
Prep Ingredients: You can prep the ingredients while the pressure cooker is heating up. You should have about 25 mins including the time to brown the chuck steak.
Brown Chuck Steak: Season one side of the chuck steak generously with kosher salt and freshly ground black pepper. Add 1 tbsp (15ml) olive oil in pressure cooker. Ensure to coat the oil over whole bottom of the pot. Carefully place the seasoned side of chuck steak in pressure cooker. Generously season the other side with kosher salt and freshly ground black pepper. Brown for 6 - 8 mins on each side without flipping. Remove and set aside in a large mixing bowl.
Make Umami Chicken Stock Mixture: While the chuck steak is browning in pressure cooker, mix 1 tbsp (15ml) Worcestershire sauce, 1 tbsp (15ml) regular soy sauce, 1 tbsp (15ml) fish sauce, 1 tbsp (16g) tomato paste with 1/2 cup (125ml) unsalted chicken stock.
Sauté Vegetables: Add 1 tbsp (15ml) of olive oil in pressure cooker if necessary. Add thinly sliced small onions & shallots and sauté until soften (~1 min). Add minced garlic cloves and stir for roughly 30 secs until fragrant. Add in the quartered mushrooms and sauté for another 3 mins. Season with salt and freshly ground black pepper if desired.
Deglaze: Pour in 1/2 cup (125ml) Guinness draught and completely deglaze the bottom of the pot by scrubbing the flavorful brown bits with wooden spoon. Pour in the remaining ½ cup (125ml) Guinness draught.
Pressure Cook Vegetables: Add 1 bay leaf, 2 sprigs thyme, 1 sprig rosemary, 12g 70% dark chocolate, russet potato chunks, carrot chunks and chicken stock mixture in the pot. Mix well. Close lid and pressure cook at High Pressure for 4 minutes and Quick Release. Open the lid carefully.
Cut Chuck Steak: While the vegetables are pressure cooking, cut the chuck steak into 1.5 – 2 inches stew cubes. Place all chuck stew meat and the flavorful meat juice back in the large mixing bowl. Add 1.5 tbsp (12g) flour in mixing bowl and mix well with the stew meat.
Pressure Cook Irish Stew & Yukon Gold Potatoes: Remove half of the carrot chunks & all mushrooms from pressure cooker and set aside. Place beef stew meat and all its juice in pressure cooker. Partially submerge the beef stew meat in the liquid without stirring, as you don’t want too much flour in the liquid at this point. Layer a stainless-steel bowl filled with halved Yukon gold potatoes on top. Close lid and pressure cook at High Pressure for 32 minutes + 10 minutes Natural Release. Turn off the heat. Release the remaining pressure. Open the lid. Remove and set aside the stainless bowl.
Thicken Beef Stew and Add Vegetables: Discard bay leaf and the herbs. On medium heat (Instant Pot: press Sauté button), breakdown the mushy russet potatoes with wooden spoon. Stir to thicken the stew. Add sautéed mushrooms, and the previously set aside carrots in the pot. Taste and season with kosher salt and freshly ground black pepper if necessary.
Make Mashed Potatoes: It may be a good idea to drain & transfer the potatoes to a larger mixing bowl. Mash the cooked potatoes with a potato masher. Mix in 100ml whole milk and 1 – 2 tbsp (14g -28g) unsalted butter. Season to taste with salt & pepper.
Serve: Garnish with Italian Parsley. Serve Irish beef stew with mashed potatoes.