Preheat grill to 400-450F. (Or preheat oven to 425F).
To prepare the relish, mix all relish ingredients in a bowl and chill until ready to serve. This can be done up to 4 hours in advance.
In a skillet over medium heat, melt butter. Season pork by rubbing honey, salt, pepper and coriander over it. Add pork to skillet and cook, turning occasionally, for 3-4 minutes or until all sides are slightly browned.
Grill (or roast) over indirect heat for 40 minutes or until pork is cooked through, turning half way. Transfer pork to a cutting board and let rest for 3 minutes, then slice.