Place the parsley, scallions, thyme, capers and lemon juice and zest into a food processor and pulse until chopped and well combined. With the motor running, drizzle in the olive oil, and let the motor run until it is nicely combined. Add the pepper flakes and season with salt and pepper.
Notes
Vegetarian Salsa Verde
I left out the anchovies, but kept the capers, so this could work for vegetarians. I also went for scallions, to keep to the green theme.