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Macerate the Berries: In a medium bowl, lightly mash 1 cup of berries with a potato masher or wooden spoon. Fold in sugar, lemon zest and juice and stir until a syrup begins to form. Fold in remaining 2 cup of berries until everything is well coated, then let sit at room temperature for 1-2 hours.
Once berries are ready, preheat the broiler to high and move your top oven rack as close to the broiler as possible. Place toast slices on a baking tray and top with slices of brie, letting the edges hang off a bit. Broil for about 30 seconds, keeping a close eye so the cheese doesn't melt too much. Once brie is soft and lightly bubbling, remove from the oven and transfer toasts to plates.
Top with a smattering of macerated berries and serve immediately, along with plenty of napkins!
Sprinkle the brie with a bit of granulated sugar before broiling for a sweeter, crème brûléed effect.