1. Combine starter ingredients and let rise overnight.
2. Soak raisins in heated orange juice and zest for 20-30 minutes.
3. Mix flour, sugar, spices, salt, egg, milk, and starter into a shaggy dough.
4. Knead in butter, raisins, and juice until incorporated.
5. Perform 4-5 stretch and folds over 2 hours.
6. Let dough rise at 77°F until bulked by 50%.
7. Refrigerate overnight or allow to rise overnight at room temperature.
8. Shape dough into 12 balls, place in a greased dish, and let rise until doubled.
9. Preheat oven to 375°F.
10. Mix flour and water for crosses, pipe onto buns.
11. Bake for 25-28 minutes until golden brown.
12. Mix glaze ingredients and brush over hot buns.