Rick Bayless has a great recipe:
1. Get grill very hot
2. Put a can of chipotle peppers in abobo(sp?) sauce in a blender, blend until smooth.
3. Brush on the meat, light brush, not so hot, a lot of the stuff, nice spice
4. Place meat on grill, about 2min a side
5. Rest meat 5min, CUT AGAINST THE GRAIN
This is an awesome, quick prep, but the Chipotle are nightshades.