Preheat oven to 400 F. On lightly floured surface, roll thawed
pastry sheet to 14x12" rectange. With sharp knife, cut off 2" from
long side to make a 12" square; cut 14x2" strip lengthwise into
four 1/2" wide strips. Brush edges of pastry square with water;
attach a pastry strip on top of each edge, pressing gently and
trimming to fit. Place on baking sheet.
Sprinkle almonds over pastry (not over strips).
In bowl, combine plums, 1/4 cup sugar and the lemon zest; toss to
combine. Arrange plums, overlapping, in rows over almonds; reserve
any juices from plums. Sprinkle plums with remaining 2 tb sugar.
Bake 20 to 25 minutes or until browned and bubbly. Brush top with
any reserved plum juice. Serve warm or at room temperature.