Purée tahini, water, salt, and garlic in a blender. Scrape down sides of blender with a spatula and add lemon juice and parsley.
With motor running, slowly drizzle in oil. Don’t overblend—make sure flecks of parsley are still visible in dressing.
Serve immediately or refrigerate in an airtight container for up to 1 week.
Keep this satisfying sauce on hand for use as a dip, spread, or sauce for veggies or protein.
Per serving (1/4 cup): 284 Calories, 4 g Protein, 6 g Carbohydrates, 2 g Fiber, 29 g Total fat (4 g sat), 154 mg Sodium, ★★★★★ Vitamin K, ★★ Vitamin C, Phosphorus, ★ Vitamin B1 (thiamine), E, Calcium, Iron