In a medium bowl, combine all of the ingredients except the cucumber.
Stir everything together until all ingredients are fully mixed in.
Assembling the Gurkensalat
Thinly slice the cucumber into rounds that are between 1/8" and 1/4" thick. Discard both ends of the cucumber.
Add the cucumber into the bowl with the quark dressing and toss to combine.
Cover the bowl with a lid or plastic and place it in the fridge for 45 minutes to an hour before serving.
Notes
This gurkensalat is yummy made the day before and just left in the fridge until it is time to serve. It will stay good for about 3-4 days in the fridge if covered.