Preheat oven to 350° F.

Slice off top rind of brie.  Place in a small, parchment paper lined baking tray.  Bake for 15 minutes or until soft.

While the brie bakes, melt butter in a small saucepan.  Add onion and cook for 2 minutes or until translucent.  Add berries, balsamic vinegar and maple syrup.  Stir, reduce heat and simmer for 10 minutes.

Remove brie from oven, carefully transfer to a serving plate.  Spoon berry compote on brie, garnish with a rosemary sprig and serve with crusty bread, crackers or bagel chips.