Gluten-Free Apricot Mascarpone Galette

recipe gluten-free pie dough

recipe Flakiest, All-Butter Pie Dough

ripe but firm apricots (about 8 medium), halved, pitted, and sliced into eighths ((3-4 cups of fruit))

sugar, plus extra for sprinkling ((2 ounces))

tapioca starch ((or cornstarch))

squeeze lemon juice

mascarpone ((4 ounces))

milk, cream, half and half, or melted butter, for brushing the dough