A simple way.
1. Marinate in your choice of marinade.
2. Grill fast over a hot fire.
3. Slice thin across the grain.

I've used Italian salad dressing, Lawry's marinades, worcestershire-mustard and maybe a few others. All have turned out good, and make a nice novelty at a group bbq.
Gravy or not to gravy...that's up to you.