In a pot, combine the prepared loquats with 1/2 cup of water and cook until the fruit is tender, about 15 minutes. Meanwhile, sift together the allspice, cinnamon, flour, ginger, salt, and sugar.
Stir the sifted dry ingredients into the cooked loquats. Continue to cook over medium heat until the mixture visibly thickens, then remove it from the heat and let it cool down.
While the filling cools, prepare your pastry for an 8 or 9 inch pie plate. Once the loquat filling has cooled a bit, pour it into the pie dish over the bottom crust. Cover with the top crust and bake at 450°F for 10 minutes, then reduce the oven temperature to 350°F and continue baking for another 30 minutes.