Make the tahini yogurt dressing: In a small bowl, whisk together the coconut yogurt, tahini, lemon juice, garlic, salt, cane sugar, sumac, and chili flakes. If needed, add 1 to 2 tablespoons (15 to 30 mL) water for desired consistency. Store in an airtight container in the fridge for up to 4 days. (It makes a great veggie dip.)