START: Fill a large bowl with water. Quarter the potatoes lengthwise, then slice about 1/2 inch thick; add the slices to the water as you go. after all the potatoes have been sliced, drain in a colander set in the sink and rinse briefly under cool water. Drain well, shaking the colander to remove as much water as possible. On a 6-quart Instant Pot, select More/High Sauté. Add 4 tablespoons of butter and let melt. add the potatoes and 1 teaspoon salt, then stir until the potatoes are well coated. stir in 1/2 cup water, then distribute in an even layer.