In a high-speed blender or food processor, combine the feta, sour cream, lemon juice and zest, olive oil, garlic, and dried herbs. Blend for 2–3 minutes or until smooth and creamy.
Tip: Feta blends more easily when it's at room temperature, so pull it out of the fridge about 30 minutes before you start. If the dip is too thick, blend in a little water—just a teaspoon at a time—until you get the texture you want.
Add salt and pepper, pulsing to combine. Go light on the salt at first—feta is naturally salty, so you might not need much.
Spoon the dip into a serving bowl, swirl it a little if you’re feeling fancy, and top with fresh dill. Serve with cherry tomatoes, black olives, and your favorite crackers.