Preheat oven to 350° F. Line a baking tray with parchment paper and set aside.
Heat the guava paste for 30 seconds in the microwave. Mash the paste until smooth. Add the water, mix, and set aside.
Cut each sheet of puff pastry into 9 equal squares. Place 1 tablespoon of guava paste in the center of 9 of the squares. Lightly dip your fingers in water and run your wet finger through the border of each filled square. Top them all with the rest of the puff pastry. Lightly press on all the borders to seal each pastry.
Place the pastries in the baking tray leaving half of an inch of space between each one. Bake for 25 minutes. Dust powdered sugar over the guava pastries with a sifter. Wait for the pastries to cool down before enjoying them.
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Notes
Cold Dough- Your dough should always be cold. Before baking, if your dough is warm, just pop it in the fridge for at least 15 minutes. This is because cold puff pastry rises better.
Puff pastry- You need to thaw the puff pastry before using it. You can thaw it in your fridge the night before making this recipe. You can also take it out of your freezer 1 hour before using it and thaw it at room temperature. But it can thaw very quickly on a hot summer day. It's best to keep an eye on it. I used the frozen puff pastry from the Peperridge Farms store. This comes in 2 sheets that usually measure about 10x15 inches each.
Substitutions—If you can't find guava paste, you can also use guava marmalade. It doesn't have the same thickness, but it's the best substitute.
Storage- To store the pastelillitos de guayaba, use an airtight container and leave it at room temperature. I always like to keep my pastelillos in the oven or microwave. They will be good to eat for up to 5 days.
Yield- The recipe yields 9 guava pastries, but you can get more or less depending on what size you cut the dough. If you want to make mini pastelillos, cut each sheet of puff pastry into 16 pieces and add only half a tablespoon of guava paste. Cook, sprinkle with some powdered sugar, and enjoy!