Add the tahini, Greek yogurt, extra virgin olive oil, grated garlic, lemon juice, cumin, onion powder, paprika, salt, and black pepper to a medium bowl. Whisk together until combined. Add the water a little at a time, whisking as you go, until the dressing is smooth, creamy, and pourable but still thick enough to coat the back of a spoon. Taste and adjust lemon, salt, and garlic as needed. The dressing should be bright, nutty, and well seasoned on its own.
⅓ cup tahini, ½ cup full fat Greek yogurt, ¼ cup extra virgin olive oil, 2 small garlic cloves, ⅓ cup fresh lemon juice, ½ teaspoon cumin, ½ teaspoon onion powder, ¼ teaspoon paprika, ¼ teaspoon salt, ¼ teaspoon black pepper, ⅓ cup water