Where can I find Three-grain bread in Tavannes?

Three-grain bread can also be found in these cities:

Biel Bienne Brugg Cernier Delémont Grenchen Ipsach Le Landeron Lyss Moutier Neuenstadt Nidau Saint-Imier Tramelan

You can also find this in Tavannes:

Pudding Decorative Sugar Cereals Delicatessen Sausage Spice Pastes Mashed Potatoes Raisin Roll Canned Sausage