Don't stress about the puff pastry. Use a puff pastry made from 100% butter if you can. If not, Pepperidge Farms makes a decent puff pastry that you can find in the frozen aisle of every major grocery store nationwide. Cut rectangles that are 2 inches by four inches, or make any other shape that you like. I have done squares, circles, and triangles before.
Keyword French Desserts, Lemon, Puff Pastry, Strawberries