Start by setting your Instant Pot to sauté mode. Once it's hot, add the olive oil.
Add the sliced Andouille sausage to the Instant Pot and sauté for about 2-3 minutes, or until it starts to brown and release its flavors.
Add the diced onion, minced garlic, chopped celery, and diced bell pepper. Sauté for another 2-3 minutes until the vegetables start to soften.
Stir in the tomato paste, cayenne pepper, smoked paprika, oregano, thyme, Worcestershire sauce, salt, and pepper. Continue to cook and stir for an additional 2 minutes to toast the spices and develop flavor.
Add the Basmati rice to the pot and stir well to coat it with the tomato mixture.
Pour in the seafood broth and give everything a good stir to combine.
Cancel the sauté mode on the Instant Pot, and secure the lid in the sealing position. Set the Instant Pot to Manual (Pressure Cook) mode and cook on high pressure for 5 minutes.
Once the cooking time is complete, allow for a natural pressure release for about 10 minutes. Then, manually release any remaining pressure.
Open the Instant Pot and add the raw shrimp. Stir them into the hot rice mixture. The residual heat will cook the shrimp. Close the lid for a few minutes to help the shrimp cook through. They should turn pink and opaque.
Once the shrimp are cooked, fluff the Jambalaya with a fork and serve hot.
Garnish with chopped fresh parsley, if desired, and enjoy your homemade Instant Pot Jambalaya!