Easy buttermilk recipes are found at TheKitchn.com, FoodNetwork.com, FoodieWithFamily.com and Epicurious.com. These recipes differ by the types of ingredients used, including lemon juice, heavy cream and store bought buttermilk.
To make the Kitchn's buttermilk, combine 1 cup of milk with 1 tablespoon of lemon juice, and let the mixture sit for five to 10 minutes. Use 4 1/2 teaspoons of lemon juice to make Food Network's buttermilk, and let the mixture stand for 10 to 15 minutes instead.
Alternatively, the Kitchn's buttermilk calls for yogurt or sour cream. Mix 3/4 cup of yogurt or sour cream with 1/4 cup of water, and use the mixture as a buttermilk substitute in any recipe. Another version of the Kitchn's buttermilk uses cream of tartar. Combine 1 cup of milk with 1 3/4 teaspoons of cream of tartar, and let the mixture stand for five to 10 minutes.
To make Foodie with Family's buttermilk, pour 1/4 to 1/2 cup of store bought buttermilk into a jar. Top with 1 to 2 quarts of milk, and shake for one minute. Let the mixture sit in a warm place for 12 to 24 hours until thickened.
To make Epicurious's buttermilk, beat 6 cups of heavy cream for 10 to 12 minutes at medium-high speed. Beat the cream for five more minutes at high speed or until it separates into butter and buttermilk. Strain the mixture through a colander, and knead the butter for five minutes, squeezing out excess buttermilk. Strain the buttermilk through a sieve.