There is a pecan tart recipe in the Gf cooking book from Thermomix that has 130g rice -made into flour, 25g sugar, 35g GF cornflour, 20g soy or chestnut flour, 80g butter and 60g cold water - basically mill rice until a flour, add sugar and mill some more then all EXCEPT water and mix on speed 4 until breadcrumb-like mix then add water 1 Tbsp at a time on speed 3 till it forms a dough.