Vegetable Preparation: First, prepare all your vegetables by peeling and cutting them as instructed.
Onion Sautéing: Heat your choice of oil in the Instant Pot on the Sauté setting on High. Cook the onions until they're soft but not colored, stirring now and then, for roughly 5-8 minutes.
Spice Addition: Add the celery, garlic, ginger, and then the curry powder to the pot. Fry everything together until the curry emits a strong, inviting aroma.
Pot Deglazing: Add a bit of stock to deglaze the bottom of the pot, scraping any bits off with a wooden spoon, and then turn off the Instant Pot.
Adding Vegetables and Stock: Place the swede, potato, and parsnip into the pot. Cover with the rest of the stock and stir to ensure the vegetables are mostly covered by the liquid.
Cooking Under Pressure: Secure the Instant Pot lid, ensuring the valve is set to "Sealing." Select the "Manual" or "Soup" setting for an 8-minute cook time at high pressure.
Releasing Pressure: Once the cooking time ends, turn off the pot and use the Quick Pressure Release method by switching the valve to "Venting," being cautious of the steam.
Soup Pureeing: Blend the soup until it achieves a smooth consistency, then season with salt and pepper according to your taste.
Final Adjustments: If the soup is thicker than preferred, thin it out with a bit of milk, cream, or coconut milk, and adjust the seasoning as needed.
For cooking on a stovetop, simply mimic these steps in a large pot, bringing the soup to a boil before reducing the heat to simmer for about 30 minutes, until the vegetables are tender, before proceeding to blend and season.