tallow

tali a hard animal fat obtained from suet etc.; used to make candles, soap and lubricants
1929, w:M. Barnard Eldershaw|M. Barnard Eldershaw, w:A House is Built|A House Is Built, chapter VIII, section ii:

Nor were the wool prospects much better. The pastoralEnglish pastoral industry, which had weathered the severe depression of the early forties by recourseEnglish recourse to boiling down the sheep for their tallow, and was now firmly re-established as the stapleEnglish staple industry of the colony, was threatened once more with eclipseEnglish eclipse.

to tallow sheep