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Pre-heat the pressure cooker (Instant Pot®) using the BROWN or SAUTÉ setting. Add a little olive oil to the cooker.
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Season the chicken pieces with salt and freshly ground black pepper, brown it on all sides and then set it aside.
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Add the butter to the cooker and sauté the onions, celery, carrots and dried herbs for a few minutes. Deglaze the cooker with the white wine, scraping up any brown bits on the bottom of the cooker. Stir in the chicken stock, lemon juice, potatoes, bay leaf and thyme sprigs. Return the chicken to the pot, submerging it the liquid and vegetables. Lock the lid in place.
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Pressure-cook on HIGH for 8 minutes.
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While the stew is cooking combine the softened butter and flour in a bowl to form a paste (called a beurre manié).
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When the time is up, let the pressure drop naturally for 10 minutes. Then, release the residual pressure from the cooker using the QUICK-RELEASE method and carefully remove the lid. Transfer the chicken pieces to a cutting board. Cut the chicken into bite sized pieces or shred the chicken with two forks.
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Return the cooker to the BROWN or SAUTÉ setting. Using a ladle, remove some of the liquid from the stew and whisk it into the beurre manié. Then, pour the beurre manié liquid back into the cooker and bring it all to a simmer. This will thicken the stew.
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Add the peas and return the shredded or chopped chicken to the cooker and stir well. Stir in the fresh parsley, spoon into bowls and serve with crusty warm bread.