Using a rolling pin, roll the puff pastry squares to stretch them to about 4 inches by 4 inches. Don't need to overdo it, just stretch them so they're easier to work with but not too thin where they will tear easily.
In a nonstick pan on medium low heat add the butter, apples, brown sugar, salt, allspice, nutmeg, cinnamon, walnuts, and raisins. Sauté until everything is combined. Add the water and bring to a simmer until the apples start to soften and the liquid is a deep golden brown syrup. Remove from heat and set aside to cool down for 10 to 15 minutes.
Using a slotted spoon, place the apple filling into the center of the puff pastry square. Try to get as little of the syrup as possible. Save the syrup for saucing.
Fold in the corners and ends upward around the filling so everything is sealed tight. Press the top where all the ends meet so it is firmly stuck together. If there is a tear or rip anywhere, just use your fingers to pinch the pastry together to seal.
Bake in the oven for 20 to 30 minutes until golden brown. Let sit for 5 minutes before saucing and serving.