Milk
Milk is a cooking liquid or sauce that can change flavor, body, or acidity quickly. Add it gradually, then simmer, reduce, or finish gently to match the dish.
Identity
Cooking liquid
Add gradually and taste as you go.
Liquids can change seasoning, acidity, aroma, and body quickly. Add them in stages when balance matters, then simmer, reduce, or finish gently to match the dish.
Reference image
Milk reference image.

Source: Wikimedia Commons
Used In Recipes
Forms, States, and Preparations
Variations on the Classic
My German apple pancake is a little different. Where most batters use all milk, I incorporate yogurt into mine for a richer flavor. Sour cream can be substituted, and of course if you only have milk on hand, that's fine too. This pancake is very forgiving. I also use a fair amount of apples—about 1 3/4 pounds—to make sure that there's a forkful of fruit in every bite.
Source: German Apple Pancake
Substitutions
Water -> Milk
5 cups (1.2L) water, milk, or chicken stock or vegetable stock (see note)
The source lists this as an alternative in the same ingredient row.
Source: Smooth and Creamy Polenta
Milk -> Water
1/4 cup (56 grams) milk of choice or water
The source lists this as an alternative in the same ingredient row.
Source: Healthy Banana Bread!
Water -> Milk
water or milk, for brushing
The source lists this as an alternative in the same ingredient row.
Source: Fresh Apple Cinnamon Scones