How to Make It
Combine oysters, verjus, mustard, garlic, and salt in a blender. Process until finely chopped, about 30 seconds, stopping to scrape down sides of blender as needed. With blender running, remove center piece of lid, and gradually add oil in a slow, steady stream, processing until dressing is emulsified. Arrange chicories on a serving platter, and drizzle with dressing.