Notes: Up to 2 days ahead, crisp Belgian endive and watercress. Up to 4 hours ahead, make mustard dressing (step 1), cover, and chill.
In a large bowl, mix mustard with 1 1/2 tablespoons water. Add lemon juice, Worcestershire, oil, and cheese.
Trim discolored stem ends from endive. Break off 30 to 36 outer leaves and arrange 3 leaves on each salad plate.
Cut remaining endive into fine slivers. Add slivered endive, watercress, and shrimp to dressing in bowl. Mix well.
Mound salad equally on endive leaves and season to taste with salt and pepper.
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