
To make the balsamic reduction, add balsamic vinegar to a small saucepan over medium heat. Bring to a boil until thick and reduced, about 4-5 minutes.
Preheat grill to medium high heat.
Thread bread, cherry tomatoes, and juustoleipa alternately onto skewers, beginning and ending with the bread.
Add skewers to the grill and cook until cheese has softened and warmed through, about 3-4 minutes.
Serve immediately, drizzled with balsamic reduction and garnished with basil, if desired.