Frankfurter Gruene Sauce (Frankfurt Green Sauce)

Gruene Sauce is Frankfurt’s most famous condiment, a cold German herb sauce so beloved it has its own holiday (May is green sauce season in Hesse). Fresh mixed herbs get partially pureed with sour cream and onion, then folded with chopped herbs for texture, creating a sauce that’s both creamy and rustic.

The technique here is smart: two-thirds of the herbs get blended smooth for body and color, while the remaining third is finely chopped and stirred in by hand. That gives you a vibrant green sauce with little flecks of herb throughout that add freshness and bite in every spoonful.

Pressing the cottage cheese through a fine sieve is a step worth doing. It transforms grainy cottage cheese into something silky that blends seamlessly into the sauce. Skip this and you’ll have lumpy green polka dots instead of a smooth, creamy base.

Pro Tips

• The traditional seven herbs for Gruene Sauce are parsley, chives, chervil, cress, borage, sorrel, and burnet. Use whatever mix you can find, but aim for at least five different herbs.
• Serve over boiled potatoes and eggs for the classic Frankfurt presentation.
• Make this a few hours ahead. The flavors need time to marry in the fridge.
• Add the sugar sparingly. Just a pinch balances the sour cream’s tang without making the sauce sweet.

Variations

• Use Greek yogurt instead of sour cream for a tangier, lighter version.
• Stir in a teaspoon of Dijon mustard for a sharper kick.
• Serve alongside cold roast beef or poached fish as a summer main.