Place all of the ingredients (tahini, lemon juice, cold water, extra virgin olive oil, minced garlic, and salt) into a food processor or blender.
Blend until the garlic is completely minced, and the sauce is fully combined and smooth. If the sauce is too thick, add more cold water, one tablespoon at a time, until you reach your desired consistency.
Transfer the sauce to an airtight container and refrigerate until ready to use.
Notes
The tahini sauce may thickens as it rests, especially after refrigeration. Before serving, you may need to stir in a little extra cold water to reach your preferred consistency.