Thinly slice the onion.

Dice the potatoes into 2cm cubes and microwave them in a heatproof container covered with plastic wrap for 6–8 minutes at 600W.

Slice the sausages diagonally into 1cm pieces.

Heat salad oil in a frying pan over medium heat, then add the onion and sausages. Stir-fry until the onion softens.