Add butternut squash and lemongrass.
Stir in salt, pepper, lemon juice, lemon zest, and water.
Mix everything until combined. Don’t forget to deglaze the base of the insert.
Turn the Instant Pot off. Close the lid and seal the pot. Press the Manual or pressure cook button and cook the Instant Pot Minestrone Soup for 8 minutes on HIGH.
Once the cooking time has elapsed, allow the pressure to release naturally for 5 minutes, turn the steam valve to the venting position to release the remaining pressure. When the pin drops, carefully open the lid.
Remove the lemongrass stalks from the soup and discard.
Add coconut milk, lemon zest, and give it a good stir.
Cover the insert and allow the soup to simmer for 10 minutes on the Sauté setting.