1 c milk + 1 3/4 tsp cream of tartar
Yield = 1 c buttermilk
Source: Pamela Peterson
———- OR ———-
1 c milk + 1 Tbsp lemon juice (let it stand for 5-10 minutes)
Yield = 1 c buttermilk
Source: Angela Hoffman
———- OR ———-
1 c milk + 1 Tbsp white vinegar (let it stand for 5 minutes)
Yield = 1 c buttermilk
Source: www.everydayfoodstorage.net