Make the sauce first so the flavors can start coming together.
Add the tahini, yogurt, vinegar, lemon, garlic, Dijon, olive oil, some of the parsley, and seasonings to a bowl.
Whisk the dressing until smooth, adding a teaspoon of warm water as needed to smooth out the sauce.
Add the beans, veggies, and herbs to the sauce. (I reserve some herbs for garnish.)
Gently but thoroughly mix all of the ingredients until well combined.
Taste and adjust the salt, cover, and chill for at least an hour.
Just before serving, stir it and adjust the salt and pepper one last time.
Garnish with the remaining fresh herbs, and enjoy!
Notes
When you make a tahini sauce or dressing, it's normal for the consistency to be very thick. Add one to two teaspoons of warm water, stir well, and repeat until the sauce smooths out.