Assuming you are wanting to prepare it as canine bait, I would recommend tainting. Chop the 'chuck up into 1" cubes, place in a jar up to 1/2 full, cover with something porous like screen and cheesecloth so the gasses can escape while the tainting process is taking place, secure the cloth tightly so flies can't get in and store in a cool dark place for probably 3 weeks until the chunks are tainted about half way through. Then, thoroughly stir in 2 ozs of sodium benzoate per qt of bait or 4 ozs of pickling salt per qt of bait. The preservative used better permeates the cubes if one first dissolves them in water before mixing in. After the preservative is added, replace the jar covering and let it age at least a couple more weeks to be sure the tainting process has subsided. This is the time to add any other ingredients one may desire, like castor, so they can also permeate the cubes while ageing. If one puts a lid on the jar too soon before one is sure the bait is not still working, it will blow the jar apart. Good luck. Ace