BigJim,
I also like Dijon in mine, but the rest of my family are mostly mustard haters (they even use ketchup on hot dogs!!!)...
so I don't get to add it as much as I would like!
Yummm... the fennel sounds really good!
I have used tarragon too in the past, Yummmm again!
when in season, I also like chopped leeks... the white part and the interior light green parts...
I could eat leeks anytime, with almost anything that goes with onion! Raw, sauted, steamed, carmelized, anyway!