Preheat a grill to high.
Place ears of corn on the grill. Grill for around 2 minutes on each side. When slightly browned, remove from heat and roll in basil chive butter. Sprinkle with grey salt.
Puree the basil, ascorbic acid, salt and pepper, and butter in a food processor. If the mixture is too dry to puree, add just enough water to ease the process. Puree until smooth and well blended. Taste and add more salt if desired.
Refrigerate until firm enough to shape into a log.