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| | Butter : Churn buttermilk and cultured buttermilk |
 | | Most modern buttermilk is cultured buttermilk, made from low-fat or skim milk and has less than 2 percent fat and sometimes none. |
 | | Cultured buttermilk, like skim milk, consists mainly of water (about 90 percent), the milk sugar lactose (about 5 percent), and the protein casein (about 3 percent). |
 | | The milk is then cooled to 22° C (72° F), and starter cultures of desirable bacteria, such as Streptococcus lactis, S. cremoris, Leuconostoc citrovorum, and L. dextranicum, are added to develop buttermilk's acidity and unique flavour. |
| www.webexhibits.org /butter/buttermilk.html (562 words) |
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