Instant Pot Bangers and Mash with Onion Gravy

INGREDIENTS

2 lb

Russet potatoes (2-4), peeled and cut into 1-2 inch cubes

pork sausages (400 g), preferably British Bangers* (see first note)

1 cup

water

Cooked Russet potatoes (see above)

1/2 cup

green onions, sliced

1/4 cup

unsalted butter

2 tbsp

milk

Salt and pepper,

1/4 cup

unsalted butter, divided

red onion (10 oz), thinly sliced

1 cup

+ 2 tbsp beef broth, divided

2 tbsp

balsamic vinegar

1/2 cup

water

1 tbsp

cornstarch

Salt and pepper,