Are you still obsessed with coffee grease? Crema of espresso

Many friends who use coffee utensils other than Italian machines always struggle with the fact that the coffee they make is free of oil.

If we want to talk about this problem, let's look at it from two aspects. First, let's take a look at what's in a cup of black coffee besides water: caramelized sugars, flavored oils, quinic acid, and caffeine. If there is no flavor oil in the coffee, then there is no difference between stir-fried coffee and stir-fried corn (there is also oil in old corn). That is to say, it is decided that each cup of coffee from different producing areas has different taste mainly because of the difference of flavor oil. As a result, the taste of coffee becomes colorful and fascinating.

There are even questions about whether coffee made from a mocha pot is espresso. Italian is a way of extraction, and it can be regarded as Italian if you can't see the fat. But in fact, the grease is in the mocha pot, and there is an old-fashioned mocha pot with a thin curved tube on the bottom seat, and the coffee is made with golden grease like the Ruyi machine.

So do drip coffee machines, French presses, siphon pots, and hand-brewed coffee have any oil? For example, when the coffee is soaked, or even when the filter plug is pressed down, is the layer on top of the coffee in the pot considered grease? That's a layer of foam, but that's that the coffee fat is just rough.

We say that the coffee oil made by Italian mechanism is obvious and satisfying in coffee, which is determined by the method and principle of extraction. This method makes the coffee flavor oil dense and can stand in the cup for a long time, while the mocha kettle has high water temperature and insufficient pressure, even if there is grease, but it is not easy to stand for long. So he poured it into the cup and disappeared.

Drip coffee machines, siphon pots, manual brewing utensils and even pressure are extracted without pressure. For example, when the coffee liquid flows from the upper seat to the lower seat near the end of the siphon pot, the foam on the top of the coffee liquid is also the fat of coffee. It's just that this kind of grease is rough and loose and is not easy to detect in the cup.