Fat Trimming/Suet. This is the pure fat that comes from around the kidneys/loins of a beef carcass. It's hard and crumbly consistency make it much different from the regular fat trimmings around the rest of the carcass. There isn't much of this high quality fat on each carcass, which makes it highly saught after for homemade rendering.
Most commonly used for rendering to make Tallow, to then use in cooking, soapmaking, etc. Many customers also use it to make homemade birdfood! 
 
Sold in bags of around 5-8 lbs each. $4/lb for pure Suet.
 
We also have just good old regular beef fat trimmings available if you aren't looking for anything "fancy"!