tuesten
-they toast
The word tuesten is the present subjunctive form of tostar in the third person plural. There are other translations for this conjugation.
See the full tostar conjugation

tostar

Coloque las rebanadas de pan en una charola para hornear y áselas a 5 pulgadas por debajo del fuego durante 1-2 minutos, hasta que se tuesten ligeramente.
Place bread slices on a baking sheet and broil 5 inches below the heat for 1-2 minutes, until lightly toasted.
Sí, tuesten el pan, por favor, pero no demasiado.
Yes, toast the bread, please, but not too much.
Quédense y tuesten malvaviscos tanto tiempo como quieran. La noche es joven.
Hang out and roast marshmallows for as long as you want. The night is young.
¡Tuesten esponjitas! ¡Son ricas!
Roast marshmallows! They're delicious!
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