Unlike some other gluten free dough, this pastry rolls out quite well and is excellent for pies and even for things such as sausage rolls. I have used it to make gf Christmas mince pies with the addition of a little sugar. Cooking time is chilling time. It is important that the mashed potato be prepared well in advance and chilled (uncovered) for several hours beforehand. Please also ensure you weigh ingredients with an accurate kitchen scale as correct ratios are important. In response to a review, I have not tried substituting tapioca flour however in this instance think it may be too gluey.