Some might say we've lost our minds, that we're too obsessed, and that now we're even making up the idea that coffee should be stirred in a specific way. Perhaps that's partly true, but we're certainly not lying, either: in fact, it seems that coffee should be stirred in a certain way to ensure all the aromas and components blend properly. This isn't a popular legend or a way to reduce the presence of some of coffee's harmful compounds, but rather a trick for obtaining a more balanced and pleasant-tasting beverage.
No To Order, Yes To Chaos
It's a gesture we all do – and if you don't, you should definitely change your habit, even if it's bitter – but probably no one has ever wondered how to stir coffee correctly. And we can't call you inconsiderate because, after all, it's a bit of an absurd question: however, know that there really is a more effective movement to make and it's almost certainly not the one you're used to. In fact, if you usually make circles with a teaspoon, you might not get the best result: according to fluid dynamics – the branch of fluid mechanics in physics – circular movements create a stationary flow, in which the particles that make up liquids don't mix, but move in parallel and orderly directions.
This means that if you stir your coffee this way, the distribution of its constituent substances could be uneven. The best way to do this is to create an irregular motion, such as from top to bottom, or even a zigzag, which favors their dispersion. True mixing, in fact, occurs with non-uniform trajectories and by introducing variations in direction and rhythm. This behavior, called chaotic mixing, "disrupts" the stationary flows and allows the various elements to mix together, contributing to a more balanced and complete flavor perception.
The Macchiato Coffee is The Perfect Example
If stirring the coffee helps distribute the various aromatic components throughout the cup, it's easy to understand how, by adding milk, this movement becomes even more important. In a macchiato, in fact, the milk creates a real stratification: if I don't stir the coffee properly, I'll get a drink with the milk on the surface or distributed unevenly, something that could be avoided with a more disordered movement.
This is also true when it comes to sugar: distributing it unevenly leads to a different flavor with every sip. Peaks of sweetness alternate with decidedly bitter notes, resulting in an unbalanced drink that isn't always pleasant to drink. Stirring the coffee correctly, therefore, isn't just a whim, but a small trick that allows you to savor the full flavor of the coffee, appreciating its aromatic complexity.
However, we want to point out that this "correct" movement doesn't work miracles and won't lead to a completely different tasting drink: if a coffee is burnt or tastes bad, it will continue to be so. On the other hand, if we are faced with a drink with an intense and well-balanced flavor, making circles—rather than making the coffee turn into a stormy sea— will not make the coffee undrinkable. The differences are subtle and, very often, only perceived by true experts, but since we always want things to taste perfect, stirring coffee this way can help you enjoy a drink impeccable in every respect.
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