There’s a lot of milk-like stuff sold at the supermarket in that section of the store known as “the dairy aisle,” but much of it do something very different in the kitchen. The variation is fat content. Differences in how you cook with it affect things like flavor stability, texture, rising cakes and breaking sauces. A little chart demonstrates placement along the continuum from heavy cream to skim milk which explains what’s not interchangeable in recipes.
Fat-free products has virtually no fat, which means they are thin and have very little mouthfeel compared to creamy dairy. That’s okay if you’re pouring this over cereal or into a smoothie where fruit covers up the taste. But when it comes to baking, skim milk fall short. It impacts finished product because it lacks the fat that tenderizes the crumb and carries flavors.
How Fat Changes Milk
Milk with 1 and 2 percent make small increments toward improvement. Two percent is what we see in most American households, not too rich, but still creamy enough to satisfy. It is a compromise many will live with.
Whole Milk adds back almost as much of natural fat present in fresh cow’s milk. It is about three and a quarter percent. Gives you a nice creamy quality on things like pancakes and hot chocolate. The fat globules clings to your tongue and bring with them those flavor compounds that get washed off with water-based milks. That’s why recipes for sauce, custards and breads will call for whole milk. You can substitute something less fatty but it won’t taste better than the original (you’ll notice it’s flatter). Many bakers do this in an attempt to cut down on fat, but then they’re disappointed.
Half-and-half, half milk, half-cream (approximately ten percent fat), begins the cream zone. It adds body to the coffee without overpowering the espresso. At least thirty percent fat is required for whipping. Whipping cream and heavy cream both has at least thirty percent fat, with heavy cream topping out near thirty-six percent. With this much fat, the liquid traps air bubbles and holds stiff peaks. Otherwise, your whipped toppings will collapse long before you can plate that dessert.
The protein content are more stable with these changes. No matter how much fat you add to your milk, the protein will stay around eight grams per cup. The amount of fat goes up with the higher fat contents. Heavy cream contains over eight hundred calories per cup; skim milk clocks in at roughly eighty. That’s a significant difference when it comes to calories throughout the day. Most people don’t eat many dishes made with heavy cream, and even when they do, they only eat small portions.
But make these decisions not on taste but based off their functional purpose. Use whole milk for things that require flavor depth and some amount of structure: scrambled eggs, bechamel sauce, etc. Skim milk for things where you don’t really care if there’s much richness at all (oatmeal, drinks made in your blender). Heavy cream for things where you’re looking for both volume and the ability to emulsify: whipped frosting, risotto, etc.
To get around this, mix milk with some melted butter to mimic what’s missing: same thing goes with water and lower-fat milk, adjusting to match for consistency. It is a quick fix that requires no trip to the grocery store.
You should of known this earlier. Ultimately, there’s no good or bad in the dairy aisle. There’s a tool for every job. You’ll know where it fits into the fat spectrum and be able to whip up something knowing exactly how the fat globules is going to behave. The next time you pour some milk into your soup or cereal, you’ll know what they’re doing. Actually, you’ll see how it works naturaly. It would of been better if you knew sooner. You might recieve different results with more moddern methods.