1 1/2   (12 tablespoons) salted butter, softened
1 1/2 tablespoons finely snipped chives
  grated zest of 1 lemon
1 tablespoon finally chopped fresh mint
1 tablespoon finally chopped fresh tarragon
1 tablespoon chopped dill
16 slices firm white sandwich bread (crusts removed)
1 large English cucumber (peeling optional) (thinly sliced)
1 cup watercress leave