Mix the quark preparation and lemon juice. Season with salt and pepper. Wash the parsley, dab dry and pluck the leaves from the stalks, except for some for garnishing. Roughly chop the parsley.
Cut cress, up to 1/3, from the bed. Fold parsley and cress into the quark. Peel and halve the cucumber and scrape out the seeds with a spoon. Grate cucumber roughly. Squeeze the grated cucumber well with your hands, add to the quark and mix.
Spread bread with curd cheese. Fill the remaining quark into a small bowl. Cut the remaining cress from the bed and sprinkle it on the quark.