How to Make It
In a medium bowl, combine the olive oil with the lemon juice, garlic and hot sauce and season with salt and pepper. Add the celery and oysters and toss. Add the watercress and toss again. Season with salt and pepper.
Mound the salad on the baguette, close the sandwich and press to flatten slightly, tucking in any greens. Cut the baguette into 6 sandwiches and serve right away.