I remember the first time I used this recipe and didn't use the xanthan gum - I had a few kitchen nightmares that day. You really need the xanthan gum for this to help it glue together.
There's more about the St. Agnes tart in a previous post.
Unlike normal bread this is quite a moist mix (500g of flour to 420ml water) so it is mixed in the electric mixer rather than by hand kneading.
A third rice flour, a third tapioca flour and a third potato flour for these and a couple of teaspoons of xanthan gum (which replaces the effect of the gluten), 7g intant dried yeast and 1 tsp salt, sugar and baking powder.
I mixed in the walnuts, raisins and rosemary after this and left it to prove before rolling out. To roll out you need to flour your hands really well with rice flour as the dough is very soft. Remember to use rice flour as well to sprinkle on the tray to stop them sticking - easy to use normal flour out of habit, and then you have to start again.
They came out really smooth which is amazing for gluten free bread and tasting great with all those ingredients. If you are going to keep them they start to go hard even if kept in an airproof container so you just need to 'refresh' them in the oven, microwave or by toasting them before eating them.
I used the same rice/ tapioca/ potato flour mix in place of normal flour in my blinis recipe and added a couple of teaspoons of xanthan gum as well. Again, the different tastes of the flours was really good.