Instructions: How to Prepare the Mayonnaise:
1. Place the mayonnaise, mustard, watercress, and lemon juice in a blender and puree until smooth (if too thick, add a little water).

2. Season with salt and pepper to taste.

How to Prepare the Turkey Club:
1. For each sandwich, lay three slices of bread side by side.

2. Spread a layer of the mayonnaise and a small handful of mesclun on one slice of bread and top with a slice of tomato.

3. On the next slice, place the turkey, brie, and a fourth of the avocado slices. Stack the two slices of bread and top with the third.

4. Cut the sandwich in half on the diagonal.

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