Start by rinsing approximately a cup of fresh blackberries under cold water, then gently pat them dry with a paper towel. In a small bowl, drizzle a tablespoon of balsamic vinegar over the blackberries to enhance their flavor, and allow them to marinate for about 5 minutes.

Place a skillet on the stove over medium-low heat. Allow it to warm up for about 2 minutes before adding 1-2 tablespoons of butter.

Take two slices of artisanal bread and spread a generous layer of creamy brie cheese onto each slice. Spoon the marinated blackberries onto one slice, then top it with the other slice.

Gently place the assembled sandwich in the preheated skillet, pressing down slightly. Grill for about 3-4 minutes on one side, until golden-brown and the brie begins to melt.

Using a spatula, carefully flip the sandwich over and let it grill for an additional 3-4 minutes, looking for a golden-brown perfection on this side.

Remove the sandwich from the skillet and let it rest on a cutting board for a minute. Slice it in half and serve warm with a light salad.