Balsamic vinegar adds a wonderful sharpness to cut through the cheese, and pairs well with the sauteed vegetables.
you could also make these sandwiches with a panini press, if you have one.
Repeat with the remaining sandwiches.

Photo: Photographer: Morgan Hunt Glaze, Food Stylist: Melissa Gray, Prop Stylist: Joshua Hoggle
Heat oil in a large nonstick skillet over medium-high heat.
Add shallot; cook, stirring often, until softened, about 3 minutes.
Transfer the mixture to a medium bowl.
Coat 1 side of each bread slice evenly with a thin layer of butter.
Top with the remaining bread slices, butter-sides up.
Wipe the pan clean and place over medium heat.
Add 2 sandwiches; cook until crispy and browned on the bottom, 2 to 3 minutes.
Carefully turn the sandwiches over and continue cooking until the cheese has completely melted, about 2 minutes.
Transfer the sandwiches to a small baking sheet; keep warm in the oven.
Repeat with the remaining sandwiches.
- Daily Values (DVs) are the recommended amounts of nutrients to consume each day.
(-) Information is not currently available for this nutrient.