Clean and cut off any eyes or bad parts of the potatoes. Put them in a steamer basket in the Instant Pot, and add one cup of water. Set the toggle to sealing, and cook on manual/pressure cook for 5 minutes. If you are going to grill the potatoes, cook for only 4 minutes. Let the spuds have a ten minute natural pressure release and then release the rest of the pressure. Remove the basket and let the potatoes cool slightly if you are using right away, or, prepare them to go on the grill. They only need about one more minute or two on the grill to enhance their flavor.