Bring to boil and cook under pressure for 15 - 20 minutes. Release pressure and check if beans are cooked but are still firm. If not cooked enough, cook under pressure for a few minutes more. Remove from heat. Chop onions with a sharp knife very finely.
Place sausages in a microwave proof dish in one layer.
Cover with kitchen paper and cook under high for 6 minutes. Remove and allow to cool. Cut into 2-3 cm long pieces or according to your own preference. Cut beef into bite size pieces. Season with salt and crushed black pepper to taste.