In a small food processor, blend lemon juice and chopped garlic. Use 1 clove if like a milder taste or if the clove is really large; use 2 if you like garlic or the cloves are small).
Add tahini, sweetener and blend. Add 1/4 cup ice water, salt and blend until smooth. If dressing is too think add more ice water, 1 tablespoon at a time.
Notes
Add additional water for a thinner consistency. For best results, use runny tahini (not the paste which tends to get packed at the bottom of the jar).
You can easily blend this in a bowl but for efficiency I’d recommend using a small food processor.