Unfold 1 pastry sheet on lightly floured surface; cut crosswise into thirds, following fold lines in pastry.
Cut each piece crosswise into 6 rectangles.
Place, 2 inches apart, on baking sheet. Repeat with remaining pastry sheet.
Bake 10 min.
Remove to wire racks; cool completely. Meanwhile, add boiling water and lemon zest to gelatin mix in medium bowl; stir 2 min. until completely dissolved. Stir in milk. Refrigerate 15 min. or until thickened but not set.
Beat gelatin mixture with mixer 2 min. or until about doubled in volume. Gently stir in COOL WHIP. Refrigerate 20 min.
Stir raspberries into gelatin mixture. Split pastries; fill with gelatin mixture.
Mix cream cheese, powdered sugar and cold water until blended; spoon into resealable plastic bag.
Cut small piece off one bottom corner of bag; use to drizzle cream cheese mixture over pastries.