You can also use a blender to make this dressing. Blend everything but the icy cold water and then it at the end and blend to finish.I add a drizzle of honey to take away anybitterness. If you add too much honey, add a bit more lemon juice to balance it out to your taste.If it's too thick, add a bit more ice cold water to thin it out.
Add the tahini, lemon juice, garlic, olive oil, and salt to a bowl and whisk to combine.
Add the cold water and whisk for a bit or until it becomes creamy and lighter.
Store in the refrigerator for a week or so. It will thicken while in the refrigerator so feel free to add a little more cold water and whisk again, or just leave it on the counter to bring to room temperature.