This topping or sauce is one of my favorite dishes
In Germany this sauce is called "Grüne Soße". I love this dish and have made it many times with different ingredients and in different variations. I sometimes use quark, a German soft cheese, similar to ricotta, but creamier. When quark is not available Greek yogurt is just as good. The same goes for the herbs, I use parsley, green onions, chives, dill, and sometimes I use sorrel and a little bit of tarragon. The idea is to have about a cup of green herbs. Adding a clove of garlic will make the sauce pungent. In Germany it is traditionally eaten with hard boiled eggs and boiled potatoes. It tastes great with salmon cakes.