Place a steamer basket with legs in the inner pot, and add 1 cup water to the bottom of the pot. Add the cauliflower to the steamer basket.
Select Pressure Cook and set the cook time for 1 minute.
When the cook time is complete, quick release the pressure.
Open the lid and carefully remove the steamer basket and cauliflower from the inner pot. Set aside.
Carefully remove the inner pot from the base, drain and wipe dry with a paper towel, and return the pot to the base.
Add the cauliflower florets to a food processor or blender and pulse until a rice-like texture is formed. Set aside.
Select Sauté and add the olive oil and butter to the inner pot. Once the butter is melted, add the garlic and sauté for 3 minutes, or until the garlic becomes fragrant.
Add the wine and chicken stock to the pot and simmer for 2 minutes, using a wooden spoon to stir the ingredients and deglaze the bottom of the pot. Press Cancel to turn off the pot. Add the prawns and stir.
Put the lid back on and select Meat/Stew and set the cook time for 1 minute.
When the cook time is complete, allow the pressure to release naturally for 5 minutes and then quick release the remaining pressure.
Open the lid. Add the lemon juice, sea salt, and black pepper. Stir.
Transfer the cauliflower rice to a serving platter. Ladle the shrimp and sauce over the rice and garnish with the parsley. Serve warm.