In Germany green sauce is known as Frankfurter Grüne Soße. It is a traditional dish in Frankfurt and Hessen. The cold herb sauce consists of sour cream, boiled eggs, spices, and of course, herbs.
Rumours and heated discussions about the origins of the Frankfurter Grüne Soße, as well as what is considered the authentic recipe, circulate about this famous german food.
Green sauces have been known for centuries in Italy and France. It is not certain whether French immigrants or Italian trading families brought the recipe to Frankfurt. It is also unknown why the Grüne Soße didn't spread all over Germany. There is only a variant eaten in Kassel, in the north of Hessen.
The most important ingredients of the Frankfurter Grie Soß, as the green sauce is called in the local dialect, are seven particular herbs. The percentage of each herb should not be more than 30%, and 70% of the herbs should have been grown in Frankfurt.
The most famous myth is that green sauce was Johann Wolfgang von Goethe's favourite dish, invented by his mother. Locals love to connect their favourite fare with the renowned author, who was born in Frankfurt. However, there is no evidence that this rumour is true. Actually, the first recipe of Frankfurter Grüne Soße was published in a cookbook by Wilhelmine Rührig in 1860, almost 30 years after Goethe's death.
Wash the herbs and dry them on paper towel, remove the thick stems
Peel the eggs and put the yolk into a mixing bowl, ad lemon juice, 2/3 of the herbs, 1/4 teaspoon salt and the yogurt
Puree using a hand blender
Stir the sour cream into the mixture
Add the coarsely chopped egg white
At the end, add the remaining finely chopped herbs and season with pepper, salt and lemon juice.
Let the green sauce rest in the fridge for at least one hour. Serve with boiled potatoes and boiled eggs cut in halves, this is the most traditional way.
I love it to mash the warm potatoes with a fork and mix them with the green sauce. We say "mantschen" which can be translated with mess around :).
You can use mayonnaise or curd cheese instead of the sour cream, or a mix of them.
When served as a side dish with fish or meat this recipe is enough for 4 servings.
My husband doesn't like the herby Frankfurter Grüne Soße, so the variant at home is called Schnittlauch Soße. The recipe is the same, but I only use Schnittlauch (chives), 4 eggs and I add a pinch of nutmeg.