In a bowl combine the water, lemon juice, and garlic, and let the garlic thaw.
Stir until the garlic is completely thawed and mixed well in the liquid.
Add the tahini and salt and stir with a fork.
stir until homogenous - it will look like it is never going to mix, but it will eventually.
Add more water, a bit at a time until it reaches the desired consistency. The tahini should be a very thick liquid not watery to be enjoyed as a dip instead of salad dressing.