Tanthauzo :
Nthano yokhala ndi zowonjezera zowonjezera ndi kufotokoza mafuta ovuta a nyama pofuna kuphika. Kupereka kungakhoze kuchitika mwa njira ziwiri: kutentha kouma kapena kutentha kwamvula. Mu njira ziwirizi, mafuta amawotchera pang'onopang'ono mpaka atasungunuka ndipo kenaka amachotsa zosafunika kuchokera kuphika. (Mwachitsanzo, kusinthana ndi mafuta omwe amapereka mafuta a nkhumba .) Ngati bwino kusungidwa, mafuta operekedwa angapitirize kuyenda mosakanikirana kwa masabata 6 mpaka 8 mufiriji ndi pafupifupi chaka ngati mazira.
Kafukufuku wa zamankhwala amene anachititsa mafuta a nyama kukhala ndi thanzi labwino. Ngakhale mbiri yakale yopanda tsatanetsatane, mafuta a nkhumba kapena mafuta a nkhumba amakhala odzaza mafuta (monga mafuta a maolivi ndi mafuta a canola), omwe ali ndi mafuta olemera okha 40%, poyerekeza ndi 70% mu mafuta.
Mafuta a bakha amabwerekanso ndi otsika kwambiri kuposa mafuta mu mafuta odzaza, ndipo amaphika "oyera" ambiri, mwachitsanzo, sichiwotcha mofulumira monga mafuta a maolivi kapena mafuta a canola.