Salmon Salad Sandwiches (1 sandwich, 6 pts)

1 14 oz can salmon, drained and flaked
3 tbsp reduced fat mayonnaise
2 tbsp chopped pickle
1 tbsp prepared horseradish
2 tsp grated lemon zest
2 tsp Dijon mustard
2 cups lightly packed trimmed watercress
4 (4oz) whole wheat rolls
4 thick tomato slices

Toss together the salmon mayonnaise, pickle, horseradish, lemon zest, and mustard in a medium bowl. Divide the watercress among the bottom halves of the rolls. Top each with 1 tomato slice and ½ cup salmon salad. Cover wit the top.
Serve with side salad of thinly sliced cucumber and radish tossed with a touch of unseasoned rice vinegar.