Pick & Soak Red Beans: Place the beans in a large bowl or plate and pick out any debris or stones. Rinse the beans well under running tap water than soak them with enough water (3 inches water above the beans) for 8 hours or over night.
Brown Sausage: Add oil in the instant pot, hit the SAUTE function & set it on HIGH heat. When the oil becomes moderately hot gently release the sliced sausages and brown them both sides.
Saute Aromatics: Add the finely chopped onion, bell pepper & celery and saute along with the sausage for 1-2 mins. Than, add the garlic and saute for another 1 min. Thrown in all the dry seasonings mentioned above in the ingredients section "seasonings" and saute again for about 2 mins.
Deglaze pot: Add the Guinness beer (find sub in the NOTES below) and the Worcestershire sauce and stir to mix well. De-glaze the pot very well by scraping the sides and the bottom of the pot with the help of a spatula. This will help loosen any stuck food particles and prevent the BURN error. This step is important, do not rush! CANCEL the SAUTE function.
Pressure cook: Now add the over-night soaked red beans, and pour the chicken stock (water + better than bouillon combined together) , stir to mix well. Add salt according to your own personal taste preference, throw in the bay leaves. Secure the lid and PRESSURE COOK on HIGH for 35 mins followed by complete natural pressure release (it should take about 10 mins). Than, open the lid carefully and fish out the bay leaves with the help of a pair of tongs and discard them.
Thicken red beans and sausage: Take out about 1 cup cook red beans and mash them into a paste either with the help of a potato masher, the back of your ladle or in the food processor. Add the mashed red beans paste back into the pot. Stir very well until the paste is completely incorporated into the red beans and sausage gravy, there should not be any lumps. Hit back the SAUTE & set it on LOW heat. Simmer the red beans and sausage stirring often to thicken it. You can thicken the gravy more or less according to your desired consistency. Serve with white long grain rice and enjoy!