1 Make The Dressing. Put The Salt, Garlic, Mustard And Balsamic Vinegar Into A Food Processor Or Blender And Pulse To Combine. With The Motor Running, Drizzle In The Olive Oil Slowly Until The Dressing Comes Together. 2 Prepare Your Grill For High, Direct Heat. 3 Coat Quartered Radicchio With Olive Oil And Sprinkle With Salt. 4 Grill The Radicchio Over High Heat, Uncovered. Keep An Eye On Them, As They Blacken Quickly. You Want A Little Blackening, But Not A Cinder. When They