Instant Pot Asian-Style Sticky Pork Spare Ribs

1 Remove the membrane from the back of the ribs, then cut the rack into 2 to 3 sections so it fits in the Instant Pot.
2 Place the ribs in the Instant Pot. In a bowl, whisk together the hoisin sauce, soy sauce or tamari, brown sugar, rice wine vinegar, sesame oil, Chinese five spice, ground ginger, black pepper, garlic, and water. Pour the sauce over the ribs.
3 Cook on high pressure for 25 minutes. While the ribs cook, preheat the oven to 400 F.
4 Let the pressure naturally release for 10 minutes, then carefully release the remaining pressure. Transfer the ribs to a baking sheet, meat side up.
5 Stir together the cornstarch and warm water. Add it to the sauce in the Instant Pot and simmer on sauté mode until thickened.
6 Brush the thickened sauce over the ribs and bake for 10 minutes, until sticky and caramelized.
7 Garnish with sliced scallions, if using, and serve with extra sauce.