Rinse quinoa thoroughly under cold water until the water is clear. The seeds are pretty small, so use a fine mesh strainer to avoid losing any. Rinsing helps to remove saponin, a bitter-tasting compound which forms a coating around each seed.
Add water, quinoa, salt, and pepper to the pot. Give the ingredients a quick stir, then close the lid.
Cook quinoa on High Pressure for four minutes.
When the cook time is complete, do a quick pressure release (move the instant pot valve to its Venting position)