Mix first 3 ingredients in small bowl to blend. (Can be prepared 1 day ahead. Cover and refrigerate. Bring to room temperature before using.) Spread bread with butter mixture. Cover with cucumber slices, then salmon. Sprinkle with pepper. Cut each sandwich into 4 triangles. Top each with dill sprig and serve. 2 servings *A dense, square-shaped, light-colored bread. Available in refrigerator-deli sections of most supermarkets. appet 38