Cook the potatoes in boiling,
salted water for 15 mins until tender.
Meanwhile, heat a non-stick frying pan
and add the sausages. Cook over a
medium heat for 15-20 mins, turning
occasionally, until cooked through.
Remove from the pan and keep warm.
Add a knob of the butter and the onion
to the pan, then cook for 15-20 mins until
soft. Stir in the flour, then gradually add
the stock, stirring to make a sauce.
Simmer for 2 mins, then pour into a jug
and keep warm.
Cook the apples in half the remaining
butter for 5-10 mins until softened. Drain
the potatoes and mash well with the
rest of the butter and the milk. Fold in
the apple, then serve with the sausages
and onion gravy.