I love mosto!!! Since I'm not a wine-drinker, I've always loved mosto. There's white and red mosto, too...
If you want a good mosto substitute, just buy Welch's white grape juice from concentrate and mix it heavy (less water than it calls for). It's not the exact replica, but it's close enough for not having to shell out plane fare and getting some Don Simon in the store...stick a few cubitos de hielo and an orange slice in your tall skinny glass and you're halfway there!
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Ongi etorri!