Combine raisins and juice. Cover and microwave on high power 45 seconds. Let stand 2 minutes. Combine cheese, tomatoes, basil, garlic and pepper flakes. Mix well. Stir in raisin mixture.
Trim ends of endive and separate heads into spears. Spread cheese mixture on endive spears. Arrange spoke-fashion on serving platter. Serve immediately or cover and chill up to 2 hours before serving. Garnish with basil sprigs.