Bolivian Spanish word
el mosto
Meaning: fresh, unfermented grape must
How it is used in Bolivia
In the wine valley, mosto is the fresh pressed juice of the grape before it ferments, non-alcoholic. Along with jugo de uva it's the standard non-alcohol option on a bodega visit, so you taste the same vineyard without the alcohol.
In Tarija's wine valley, mosto is the natural non-alcohol drink from the same grapes, a warm, local thing to ask for at a tasting.
A grape juice you'll see around Tarija's wine valleys, a completely normal non-alcohol drink to order alongside, or instead of, anything else. What you drink is always your easy choice.
Learn it in a real situation
Explore Tarija, Practical Spanish for Bolivia