Wash the potatoes and cook in boiling water for about 15 minutes. Drain potatoes, rinse with cold water and peel. Wash the asparagus and cut off the woody ends. Peel white asparagus whole, green asparagus only at the lower third.
Cut the asparagus diagonally into thin slices. Blanch the asparagus in boiling salted water for 1-2 minutes and drain. Coarsely chop the walnuts. Wash chives, dab dry and cut into fine rolls.
Mix vinegar, salt and pepper. Add walnuts and half of the chives. Whip the walnut oil into it. Mix the asparagus and vinaigrette and let it steep a little. Finely dice the bacon and leave it crispy in a pan.
Add the potatoes, fry briefly, season with salt and pepper and keep warm. Wash the plaice and dab dry. Season with salt and turn in flour. Heat fat and oil in 2 large frying pans and fry the plaice for 6-8 minutes while turning.
Serve with bacon potatoes and asparagus salad. Sprinkle with remaining chives and serve garnished with parsley.