1. Preheat oven to 400 degrees F. Beat egg and water with wire whisk until blended; set aside. Unfold pastry on lightly floured surface. Roll into 14x10-inch rectangle; cut in half lengthwise. Brush both pastry halves lightly with some of the egg mixture. Sprinkle 3 Tbsp. of the cheese and the pepper evenly over 1 of the pastry pieces; cover with ham slices. Place remaining pastry piece, egg side down, over ham. Roll gently with rolling pin to seal. Brush with additional egg mixture.
2. Roll jelly roll fashion to make 14-inch log. Cut into 24 equal slices. Place, cut side down, on parchment-covered baking sheet. Brush with remaining egg mixture; sprinkle with remaining 1 Tbsp. cheese.
3. Bake 12 to 14 min. or until golden brown. Serve warm or at room temperature.

Yield: 12 servings