Tomato, Watercress, and Chive Butter Sandwich

4 tablespoons butter,

juice of 1/2 lemon

1/2 bunch fresh chives, sliced

12 slices thinly sliced wheat bread

tomato, very thinly sliced

salt and pepper

watercress, stems trimmed, washed and dried

Mix together butter, lemon juice, and chives in small bowl to make a paste.  Spread thinly over all the bread.  Arrange on layer of tomatoes over half the bread slices and season with salt and pepper.  Top with 2 or 3 watercress leaves and top with slice of buttered bread.  Press to seal, trim crusts and cut into triangles.