Thaw pastry sheet at room temperature for 30 mins. Preheat oven to 400°F.

Unfold pastry on lightly floured surface. Cut into 3 strips along fold marks and cut each strip into 4 rectangles and half those rectangles.

Place triangles 1" apart on baking sheet and bake for 15 mins or until golden. Cool on wire rack.

Split pastries into 2 layers making 48 total triangles. Spread pesto on 16, tomatoes on 16, and combine into Napoleons.