I'm not the pro at making a good burger, I would let B take the credit for that. He leaves the cooking to me, except when it comes to Steaks and Burgers.
When it comes to burgers, I like a LOT of flavor, especially since you're pretty much eating a glob of meat. I didn't want to use dry spices, since I feel like they get lost in the flavor of the burger most times. I opted for Trader Joe's Roasted Pepper Tapenade for flavor. It worked out really well. I could taste the flavors of the burger as well as the tapenade.