tostaran
-they toasted
The word tostaran is the imperfect subjunctive form of tostar in the third person plural.
See the full tostar conjugation

tostar

Oh, sí, se tostarán.
Oh, yes, they'll be nice and toasty.
El viaje continuará en la granja/atelier de los hermanos Guillén, donde un grupo de chocolateros tostarán y molerán a mano el cacao y fabricaran chocolate para su disfrute, a la vez que les invitaran a formar parte del proceso.
The trip will continue at the Guillen brothers farm/atelier where a group of chocolatiers will roast, hand grind cocoa and make chocolate for your enjoyment and will ask you to participate in the process.
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