This article is from the Cooking and Conversions FAQ, by with numerous contributions by Victor Sack cooking.faq@mac.com others.
Evaporated milk and sweetened condensed milk both come in cans, both are
thick and a weird colour... but are not, as I thought when I was small,
the same thing. Sweetened condensed milk is, as the name implies, mixed
with sugar or another sweetener already. It isn't found everywhere, but
this recipe makes a good, quick substitute: Mix 1 cup plus 2 tablespoons
dry (powdered) milk and 1/2 cup warm water. When mixed, add 3/4 cup
granulated sugar. If you're not sure whether it is available in your
market, try looking with the nonrefrigerated milk products - "Good Luck"
is apparently a common brand in North America.
If a recipe calls for buttermilk or cultured milk, you can make sour
milk as a substitute. For each cup you need, take one tablespoon of
vinegar or lemon juice, then add enough milk to make one cup. Don't
stir. Let it stand for five minutes before using.
The minimum milk fat content by weight for various types of cream:
(UK) (US)
Clotted Cream 55%
Double Cream 48%
Heavy Cream 36%
Whipping Cream 35% 30%
Whipped Cream 35%
Single Cream 18% (=Light Cream)
Half Cream 12% (=Half and Half*)
 
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