Celeriac Soup

1½ lb Celeriac, chopped
1 cooking apple, cored and chopped
2 tbsp olive oil
1 large onion, finely chopped
1 tsp mustard
1 veg stock cube
salt and pepper
pint of milk (or less maybe)
pint of Water

Fry celeriac, apple, onion, mustard, stock cube, seasoning in oil for 5 mins.

Cover pan, turn right down and let it cook in it's own juices until tender.

Add water, bring to boil.

Remove from heat, liquidize.

Add milk (til good consistency), return to heat until just short of boiling.