Place the prepared potatoes in an Instant Pot with water, a good pinch of kosher salt and the vinegar, if using. On the pressure cook setting, cook the potatoes for 5 minutes.
Allow the pressure to release naturally for 5 minutes before flipping the switch to manually release the remaining pressure.
Immediately lift the lid and drain the cooked potatoes. To avoid clumping, spread them on a baking sheet and allow them to cool for 10 minutes.
Melt the Steakhouse Better Butter in a skillet over medium heat. Add the cooked potatoes. Flipping, fry them on all sides until golden. Serve warm.
