Clean and wash the cucumbers and cut them in half lengthwise. Scrape out the seeds with a teaspoon. Clean and wash spring onions and cut them into fine rings. Peel and finely chop the onion.
Wash the chives and cut into fine rolls. Wash the borage and chop finely, except for a few leaves for garnishing. Stir curd and milk until smooth, season with salt and pepper. Stir the spring onion rings, diced onions, 2/3 each of the chives rolls and radish sprouts as well as the chopped borage into the quark.
Clean radicchio and frisée salad. Remove the leaves from the stalk one by one, wash and drain. Mix vinegar, salt and pepper well, add oil. Mix salad leaves and vinaigrette.
Fill cucumber halves with the herb curd cheese and arrange with some salad leaves. Serve garnished with coarse pepper, remaining chive rolls and radish sprouts.