How to recognize the presence of garlic in your recipe? By the smell. But rarely are used soft expressions concerning quality and smell of cloves. Odoraccio, stench, stink, stench, stink, miasm, exhalation, unhealthy, appestante, fetenzia etc. Yet more than half of the world like it.
The molecule most responsible is the Alliin, but not directly, because this is completely odourless and tasteless.
The Alliin alone is not enough. It is necessary that this substance will join to an enzyme contained in the same wedge, the Allinase. By their reaction it gets the real head of the perfume, the Allicin. When we hit or cut a clove of garlic, damaging cells and allow the enzyme to mingle with alliin and perform magic. The allicin has a low (2%), and solubility in water, and is rapidly degraded and destroyed during cooking.
Raw garlic
The allicin degrades rapidly, generating many other molecules, so having to use fresh garlic it is always better to prepare it at the moment.
At high temperatures, or in very acidic environment, the allicin loses effectiveness. If we consider all suggestions to reduce the strength of the aroma is always to boil (in milk?). But why ruin it this way?
Cooked garlic
When a recipe requires to use while cooking the cloves of whole garlic and even sometimes still in their shirt, keep in mind that the situation is quite different because the allicin cannot form. You will be also various substances, instead perceived mostly dolciastre that contribute in varying degrees to the final flavor. But at this point the clove I need to eat, because otherwise you have made an effort unnecessary..
The complete abbrustolimento on the other hand, brings the garlic to a decidedly bitter flavor.
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