Right before serving, I tossed in the herbs.
None of the original recipes I looked at the first time had this herb addition. Wow, did it add to the dish. It tasted like summer in a bowl.
Please ignore the fact that the steak is over cooked :-(
This is the basic recipe I followed (except I didn't use bell peppers, and I used just the three herbs).
http://www.bonappetit.com/recipe/sweet-bell-pepper-and-onion-salad