Combine all the ingredients for the mop in a bowl and mix well. Cut off the tough stem ends of the asparagus, rinse and place in non-reactive, shallow bowl. Pour the mop over the asparagus and marinate, at room temperature, for an hour.
Start the grill or a charcoal fire. Grill the asparagus over medium heat for 2 minutes on each side or until done but still crisp.
