Final answer:
The wine Montilla-Mortiles from southern Spain is fortified during the wine making process. Fortification occurs during the fermentation process by adding a distilled spirit to increase alcohol content and stabilize the wine.
Step-by-step explanation:
The wine Montilla-Mortiles from southern Spain is fortified during the wine making process. Fortification is the process of adding a distilled spirit, typically brandy, to the wine to increase its alcohol content and stabilize it.
In the case of Montilla-Mortiles, fortification occurs during the fermentation process when the grape juice is mixed with the distilled spirit. This helps preserve the wine and create a unique flavor profile.