Peel the potatoes, grate finely, place in a clean tea towel and squeeze well.
Pluck the leaves from the thyme.
Mix the grated potatoes with the thyme, egg yolk, 1 tsp. flour and potato starch and season with salt, pepper and nutmeg.
Season the pike-perch fillets with salt and pepper, dust with flour and coat with the potato batter.
In a frying pan with enough olive oil over medium heat, fry the fillets until crispy on both sides.
For the pea puree, pod the peas. In a saucepan with 2 tablespoons of butter and vegetable soup, steam the peas until tender, season with salt, pepper and a pinch of nutmeg.
Finely puree the peas with a blender and pass through a sieve. Season with salt, pepper and a pinch of sugar.
Serve the pea puree with the pike-perch.
Preparation Tip:
Instead of pike-perch, you can also use another firm-fleshed fish.