Sauce verte
Green sauce or greensauce is a family of cold, uncooked sauces based on chopped herbs, including the Spanish and Italian salsa verde, the French sauce verte, the German grüne Soße or Frankfurter grie Soß , the British mint sauce and greensauce, and the Argentinian chimichurri.: 354 The Mexican salsa verde, though also called a "green sauce", is instead based on tomatillos and is commonly cooked; the New Mexico version uses a green chile base. Green sauce has a long history in many parts of Europe. It was certainly present in the Middle Ages, and may date to the Classical period.: 354
Source: Wikipedia
Recipes
Sauce Verte (Green Herb Mayonnaise) | Recipes | Delia Smith
Sweet Sauce Verte, flavoured with summer herbs, is sublime on meat or fish. I think it is best made the day before, if possible, to allow the flavours to develop. This goes beautifully with Baked Whole Salmon (see related recipe below). The Delia Online...