Mortar and pestle. Ceramic. The problem with grinding nuts and seeds manually is that they contain oil, and that makes them soft enough once you get started to clog burr-type grinders like hand-crank coffee mills. If you are grinding nutmeats coarsely there are several good little hand operated grinders, generally having steel "fingers" on an axle with a crank. Some have glass jars incorporated into their workings to catch the pieces. Avoid such grinders with plastic "fingers." They are unreliable. But generally, for nuts and seeds, I recommend a ceramic mortar and pestle. They are inexpensive and readily available. For my own personal use, I have Kitchen Aid blade type coffee grinder with a removable stainless steel cup, and I also sometimes use the dry container on my Vita Mix.