(use any combo of herbs, garlic or garlic scapes, and/or greens! - Nica)
INGREDIENTS
1 cup packed fresh flat-leaf parsley leaves
1/4 cup each packed stemmed spinach and watercress leaves
2 tablespoons coarsely chopped fresh chives
1 tablespoon of chopped fresh chervil, tarragon, basil, dill, thyme, or sorrel (either a single herb or in any combination)
1 teaspoon salt
1 teaspoon anchovy paste
1 cup (2 sticks) softened unsalted butter
PREPARATION
Chop together 1 cup packed fresh flat-leaf parsley leaves, 1/4 cup each packed stemmed spinach and watercress leaves, and 2 tablespoons coarsely chopped fresh chives. Add a tablespoon of chopped fresh chervil, tarragon, basil, dill, thyme, or sorrel (either a single herb or in any combination) and chop again to blend the flavours. Put in a bowl and mix in 1 teaspoon salt and 1 teaspoon anchovy paste. Add 1 cup (2 sticks) softened unsalted butter until the herbs have been thoroughly blended and the butter is completely green. [Editor: Melt a tablespoon of this butter on top of grilled lamb chops or fish, or stir into plain cooked vegetables.]
Source: "Epicurious" https://www.epicurious.com/recipes/food/views/Fines-Herbes-Butter-51127810