In a bowl, sift together flour, rice flour, powdered sugar, salt & baking powder. Add butter & rub together with fingertips to make soft crumbles.
In a small bowl, beat egg; add to flour mixture & work into a smooth ball of dough. DO NOT OVERMIX. Flatten dough ball & wrap in plastic wrap; chill in refrigerator.
Rice Pudding (Filling)
Place rice in a saucepot. Cover with water & bring to a boil. Rinse rise; return blanched rice back in saucepot & cover with milk. Add cinnamon stick & lemon zest. Cook over low heat, stirring often until rice has absorbed most of the milk & rice mixture becomes soupy.
Remove rice-milk mixture from heat & add butter; stir well. Place rice mixture in a bowl to cool. Stir & cool for about 20 minutes. In a bowl, combine eggs, sugar & vanilla; add to cooled rice mixture.
Preheat oven to 350 F.
Roll out the chilled pastry to a 1/8-inch thickness. Traditionally these little rice tarts have straight sides. The fastest way to do this is to cut out pastry disks with a glass or lid as big as the bottom of the muffin tin & press them gently in. Next cut with a knife some pastry strips to line the sides of the muffin tins. Press the pastry lightly with your fingers to seal the bottom with the side strips.
Spoon the rice pudding into the pastry shells & bake about 30-40 minutes or until golden brown on the edges. Prepare raspberry topping.
In a saucepan, place frozen raspberries & heat until thawed. Stir in the sugar & bring to a slow simmer. In a cup, dissolve the cornstarch in water & stir into raspberry puree. Bring to a boil & simmer for about 1-2 minutes or until thickened. The mixture will thicken a bit more as it cools.
Serve rice tarts warm or cold with raspberry topping & yogurt, whipped cream or ice cream. If you would prefer, just a dusting of icing sugar or as is works just as well.