With a vegetable peeler, remove and discard a long strip of dark green skin from one side of one of the cucumbers. On that same side, continue to pare long thin strips edged in dark green until you reach the seedy portion—you should get about 3 strips. Rotate cucumber a quarter turn and continue paring, working your way around the cucumber. Repeat with the remaining cucumbers—you will need about 3 dozen strips in total. Bring a saucepan of water to a boil. Add the cucumber strips and blanch for 5 seconds. Immediately drain and refresh under cold running water. Lay the strips on paper towels to dry.
Blend cream cheese, smoked salmon and horseradish in a small bowl. Shortly before serving, spread about 2 teaspoons of the salmon mixture on each slice of bread. Arrange a cucumber strip over each canape and top with a few eggs of salmon roe (or red caviar). Garnish with pepper and a dill sprig.
Make Ahead Tip: The cucumber strips and salmon spread will keep, covered, in the refrigerator for up to 1 day.
41 calories;1 g fat(0 g sat); 1 g fiber; 6 g carbohydrates; 2 g protein; 5 mcg folate; 13 mg cholesterol; 1 g sugars; 0 g added sugars; 49 IU vitamin A; 1 mg vitamin C; 29 mg calcium; 1 mg iron; 100 mg sodium; 40 mg potassium