Mix flours, praline paste and salt together in a large bowl. Add chopped butter and blend together with a pastry cutter or your hands. The mixture should be coarse and crumbly.
Add your ice water a tablespoon at a time and mix until dough comes together. You may not need the whole amount of water, be careful not to over add.
Form dough into a ball and wrap in cling film. Chill for about an hour.
When ready, preheat your oven to 350°F (160C) and roll out the dough on a lightly floured surface to about ¼" (½ cm) thickness. Line your tart bases, taking care to press into the sides and corners. The dough makes enough for one large (9") tart based or multiple mini tarts (I made four 4" tarts). Place in the fridge to chill again for about 15 minutes, then line with a layer of foil and some ceramic beans or rice for blind baking. Bake the tart shells for about half an hour, then remove the foil linings and weights, continuing to bake for another five minutes. Remove from the oven and set aside while preparing your filling (leaving the oven on).