01 -
Combine blackberries, balsamic vinegar, honey, lemon juice, and salt in a small saucepan over medium heat. Simmer for 7-9 minutes, mashing the berries, until thick and glossy. Cool for 5 minutes.
02 -
Spread softened butter on one side of each slice of sourdough. Place 4 slices butter-side down on a board.
03 -
Divide the brie over the bread, sprinkle with thyme, and spoon about 2 tablespoons blackberry balsamic jam over each sandwich. Add black pepper if using, then top with the remaining bread butter-side up.
04 -
Heat a large skillet over medium-low heat. Cook the sandwiches in batches for 3-4 minutes, until the bottom is crisp and golden.
05 -
Flip carefully and cook for another 3-4 minutes, pressing lightly with a spatula, until the bread is golden and the brie is melted.
06 -
Transfer to a board and rest for 1 minute before slicing. Serve warm while the cheese is soft.