Instant Pot Pork Puttanesca

Name: Instant Pot Pork Puttanesca
Ingredients: 3 1/2 lb. skinless, boneless pork shoulder, excess fat trimmed and discarded, pork cut into 2 pieces; Kosher salt; Freshly ground black pepper; 1 tbsp. extra-virgin olive oil; 6 cloves garlic, peeled; 2 oil-packed anchovy fillets; 1/4 c. tomato paste; 1 (28-oz.) can whole peeled tomatoes; 1/3 c. pitted Castelvetrano and/or kalamata olives, halved; 1/4 c. packed fresh basil leaves, roughly chopped, plus more for serving; 2 tbsp. red wine vinegar; 1 tbsp. capers, drained; 1/2 tsp. crushed red pepper flakes; 1/2 tsp. granulated sugar; Cooked polenta and shaved Parmesan, for serving