Step 1

Place all ingredients except for lime juice in the pot and stir through. Lock the lid and make sure the valve is set to Sealing. Press the Manual button and set to High pressure for 7 mins. After 3 beeps, the Instant Pot will start to build up the pressure. Once the timer goes off, allow 5-10 minutes for natural pressure release and then use the quick release method to let off the rest of the steam.

Step 2

Remove the lemongrass piece and transfer the soup’s content to a blender or a food processor in 2-3 batches. Puree until smooth and return to another saucepan. Add the lime juice, stir through and taste for salt. You can add more salt or more fish sauce for extra seasoning. Serve with sesame seeds and fresh cilantro over the top.