Cook garlic and olive oil in a skillet over medium-low heat until tender, 3 to 5 minutes. If the garlic starts to sizzle, turn the heat down.
Add tahini, lemon juice, and salt to a food processor and pulse to combine. Use a spatula to scrape the sides of the bowl and pulse again. This should form a thick paste.
Add the tender garlic with any oil in the skillet to the tahini paste and pulse a few times. Add the water, 1 tablespoon at a time, and pulse in between additions. Continue until you achieve the desired consistency.
Serve tahini sauce with freshly chopped parsley on the top. Serve it with falafel, a crudité platter, salads, and more.
Notes
To make a spicy tahini sauce, add a teaspoon of sriracha or hot chili flakes.