French Sorrel

Have any of you hias ever had the pleasure of eating french sorrel? I've added it to my garden this year. Have you ever eaten the weed - sheep sorrel or sheep sour? It has the same flavor. I can't wait to use it in a salad. It has that delicious tartness. It looks similar to spinach. Whats really cool about it is that its perenniel...any kansas anyway.
I'm also trying lovage and burnet. Lovage has a celery flavor, Burnet has a cucumber taste. Also trying chervil, borage, and fennel. Do any of you hias use any of these herbs?