Instant Pot Chilli with Chocolate and Chipotle

Name: Instant Pot Chilli with Chocolate and Chipotle
Prep time: 10 min
Cook time: 15 min
Total time: 25 min
Cuisine: American, Mexican, Latin American, TexMex
Ingredients: 1 tbsp vegetable oil; 1 onion (finely diced); 1 red bell pepper. deseeded and finely diced; 2 garlic cloves (minced); 900 g (2 lb) mince beef (lean); 2 X 400g (14oz) tins of kidney beans (rinsed and drained); 1 tbsp ground cumin; 1 tbsp chilli powder; 1 tsp dried oregano; 2 X 400g (14oz) tins of chopped tomatoes; 30 g (1.2 oz) dark chocolate (85% cocoa solids), broken into pieces; 2 tbsp chipotle paste (or to taste); 3 tbsp beef stock; 2 tsp balsamic vinegar; Salt