Put all the below ingredients into a blender or food processor:
1 small or medium clove fresh garlic, pressed (use the entire clove)
Juice of one medium to large lemon
½ cup Greek non-fat yogurt (Chobani brand is really good) – or for a vegan version, use tofu
1 teaspoon ground sumac
¼ teaspoon salt
Freshly ground black pepper
Several teaspoons fresh parsley leaves
¼ cup EVOO
Process to a smooth consistency.
For a thicker dipping sauce, use more greek yogurt. For smoother more liquid salad dressing use slightly more EVOO.
Thanks for the sumac Louisa!