Season the perch fillets with salt and white pepper

Stack them on topo of each other in two piles

Wrap the piles tightly in a plastic wrap

Heat the owen to 75 C

Put the packages in an owen pan

Bake them in the owen until the inner temperature is 43 C

Remove the plastic wrap

Fry the perch piles in a pan in plenty of butter

Peel the potatoes

Cook them in salty water

Smash the potatoes

Add butter and dill

Notes:

Enjoy with a glass (or two) of good dry white.