Fresh skimmed milk, 1 quart;
Hot water, 1½ to 2 cupsful;
Salt, ½ teaspoonful;
Lactone tablet, 1.
Add hot water to milk; then salt; then the lactone tablet, well
crushed. Stir well, cover with clean towel, and leave at ordinary room
temperature. When the milk becomes thick and fermented set in ice-box
for use. Before using heat the buttermilk until perfectly smooth.