1Score cucumber lengthwise with tines of fork if desired. Cut into 36 (1/4-inch) slices.
2In small bowl, beat cream cheese with electric mixer on low speed until creamy. Beat in mayonnaise until well blended. Stir in chopped basil, onion, lemon peel and crabmeat.
3Spread or pipe about 1 teaspoon crabmeat mixture on each cucumber slice. Sprinkle with capers. Garnish with basil leaves.