Make lemon tahini sauce: in a mason jar, combine the lemon tahini sauce ingredients and shake well. If too thick, add more water to thin it out. If too thin, simply add more tahini paste until desired consistency. The amount of water needed will depend on whether you use tahini paste, which is thicker, or plain tahini. This dressing is versatile: add more honey, lemon juice, or tahini to taste!
In a medium pot, bring some salted water to a boil, enough to cover the green beans. Cook green beans for about 3-5 minutes, uncovered, until bright green and tender. For more tender green beans, cook an additional 2-3 minutes. Drain and rinse with cold water to stop the cooking process. Pat them try.
Arrange on a large plate, and drizzle with lemon tahini dressing. Garnish with chopped parsley and lemon slices, if desired.