Wipe the pumpkin clean with a damp cloth and cut the stalk if needed to fit in the instant pot/multi cooker. Add the rack to the bottom of the multi cooker pot and pour in 1 1/2 cups water.
Place the pumpkin on the rack, close lid, set valve to sealed position and select “pressure cook” setting on high pressure. Set time for 30 minutes and press start. If using a different sized pumpkin, I work on 10 minutes per kilo of pumpkin
Once cooked, manually release the pressure and allow the pumpkin to cool slightly before removing from the cooker, peeling, deseeding and mashing into puree.