Select the Sauté setting on the Instant Pot, add the oil, garlic, and ginger, and heat for 2 minutes, until bubbling. Add the mushrooms and sauté for 1 minute, until they begin to wilt and the ginger and garlic begin to brown on the bottom of the pot. Stir in the water and peas, using a wooden spoon to nudge loose any browned bits from the bottom of the pot. Cover with the glass lid and let come up to a simmer (this will take about 8 minutes).