The Leuku: One of the traditional knives of the Saami people who inhabit the northern forests of Europe, the leuku is a wide-bladed tool designed to serve as a hatchet, a machete, and a butcher knife. The handle is invariably made of birch, and the sheath swallows almost the entire knife. The leuku hasn’t changed in a millennium. Kellam Knives’ 7-inch carbon-blade version is a good one.