What is banneton?

A round or oval cane basket used to support shaped sourdough during the final proof or cold retard. The basket holds the loaf in shape while the wet dough relaxes, and the ridges between cane rings leave the signature concentric flour-circle marks on the finished loaf. Bannetons are typically lined with the cane itself (for the flour rings) or with a removable linen cloth (for a smoother surface). Sizes are matched to the dough weight: a 9-inch round banneton fits about 700-900g of dough; a 10-inch oval batard form fits up to 1kg. A flour-dusted bowl lined with a clean towel works as a substitute, though it won't leave the ring marks — many home bakers start there and only buy a real banneton once they're sure sourdough is sticking.