Unwrapped in all its glory on your kitchen counter, the raw, lumpy mass of suet may look intimidating, but it's actually very easy to work with. Begin by trimming away as much of the pink connective tissue as possible, leaving only the snowy white fat. Since the object is to get the suet to render fully into the pie's filling as it cooks, it's important to mince it very fine. Chopping it too coarsely could leave you with fatty lumps in your mincemeat, as opposed to a smooth, unctuous, evenly distributed layer of liquefied suet that coats and lubricates the dried fruits and other ingredients. Use a knife or a food processor; you can also grate it. Be sure to discard any additional bits of connective tissue embedded in the fat.