Prep Time 30 minutes mins
Cook Time 25 minutes mins
Resting Time 12 hours hrs 30 minutes mins
Total Time 13 hours hrs 25 minutes mins
For best flavor, use a lively, recently fed starter and avoid overproofing, which can cause the buns to spread and lose height; the dough should feel light and puffy but still spring back slowly when gently pressed. If your kitchen is cool, extend the proofing time rather than moving to a very warm spot, which can soften the butter too much and weaken structure. Adjust hydration slightly if your flour is very strong or your fruit releases moisture, adding a sprinkle of flour only if the dough is too sticky to handle. The overnight cold proof develops flavor and makes shaping easier, but you can shorten it to 4 to 6 hours in the fridge if needed. These buns are best the day they are baked, yet they reheat beautifully when split and toasted, and leftovers can be turned into excellent bread-and-butter pudding.