Green "Everything" Sauce - from Susan Spungen's Veg Forward (adapted by David Lebovitz)

Name: Green "Everything" Sauce - from Susan Spungen's Veg Forward (adapted by David Lebovitz)
Ingredients: 1 cup (240g) plain Greek yogurt; 1 cup packed (20g) aromatic herbs, such as tarragon, parsley, mint, basil, dill, and sage; 2 scallions, green and white parts, cut into pieces; 1/4 cup (65g) tahini; 2 tablespoons freshly squeezed lemon juice; 1 tablespoon capers, rinsed and patted dry; 2 medium cloves garlic, peeled; 3/4 teaspoon kosher or flaky sea salt; 2 teaspoons yondu or fish sauce, or 2-3 anchovy fillets; Big pinch of cayenne pepper; A bit of warm water