A mixture of powdered dried meat and fat, along with dried fruit[1]. The fat should be one that's solid at room temperature, preferably suet[2]
The fat to meat ratio should be about 1:1, but if you live in a hot climate use 1 part fat to 2 parts meat, or even less fat if you find that your pemmican melts in the heat. Before adding fat, toss up the pulverized meat with any other dry ingredients you're including (nuts, fruit, and spices). After melting your fat, pour it into the powdery meat and mix well. Add honey or maple syrup if you've chosen to include that.
I first heard of it while watching Life Below Zero - Northern Territories.