Turn Instant Pot to sauté. Add in the oil, pork, and shallot. Sauté 5 minutes. Add garlic, cayenne, and cracked pepper and sauté 30 seconds. Pour in broth and turn off Instant Pot.
Break the spaghetti and lay it in a criss-cross pattern. Cover with mushrooms and spinach. In a bowl stir the soy sauce, hoisin, honey, vinegar and peanut butter. Pour over top.