Combine the chickpeas, cucumber, and mint leaves in a large bowl. In a small bowl, whisk together the tahini, lemon juice, and olive oil. Add a tablespoon (or two) of water if needed. (The dressing can be on the thick side because it will thin out a bit after you toss it with the salad.)
Pour the dressing into the large bowl and toss to coat. Add salt to taste.
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