1. Cook onion in butter allow to sweat so cooked but not coloured.

2. Peel and dice potatoes.

3. Add water to onion and boil then add the potatoes.

4. Cook until potatoes are just cooked (do not let them go mushy!).

5. Add milk/cream and warm.

6. Add fish, only cook for a little time.

7. Add grated cheese, salt and pepper etc.

8. Serve in hot bowls with lemon zest and parsley garnish.

Do not overcook the potatoes or fish as the soup will lose its structure and end up just a mush!