Step 1

Slather the boned leg with mustard and garlic powder using plenty of both, coating both sides well.

Step 2

Place in a large dish and refrigerate overnight.

Step 3

Cook on an open barbecue.

Step 4

High heat to seal both sides, then medium heat to cook through, turning once.

Step 5

Cook for approximately 35 minutes for pink meat or 45 minutes for well done.