Preheat oven to 475ºF and set a rimmed baking sheet into the oven to preheat along with the oven.
Toss broccoli with oil, salt, and pepper to coat it well.
Remove hot baking sheet from oven and spread broccoli onto it, roast at 475ºF for 10-15 minutes, or until browned.
While broccoli bakes, prepare the sauce. Stir together the tahini, lemon, soy sauce, monk fruit, garlic, and coriander in a large bowl. If the sauce is very thick, add water to desired consistency. Set aside.
When broccoli is cooked, add to the large bowl containing the sauce and toss to coat. Add in the onions and cilantro and toss again. Serve with sesame seeds sprinkled over top and a bit more fresh herbs, if desired.