This is an adaptation of a Spiced Orange Hot Cross Bun I used to do as a yeasted bun. This recipe turned out beautifully soft, spicy and sweet. I'm not used to the sourdough recipe writing that I've been reading on this forum, so I'm putting the recipe up as I did it, but without percentages etc.
Blend up the orange and warm milk til smoothish
Mix the flours, sugar, sultanas and salt in mixer bowl
Add orange/milk mix, starter and butter
First prove as required
Shape & second prove
Bake 230C for 15mins, then down to 180C for 30 mins.