Preheat oven to 450° F.
Place blueberries in a heatproof, shallow roasting dish and sprinkle with sugar. Roast in the oven for 12 to 15 minutes, rolling around once or twice during cooking time to ensure they roast evenly
(The goal is not to let the blueberries fully slump or turn to sauce; you just want a little trickle of juices puddled across in the bottom)
Squeeze a bit of lemon juice over berries the second they come out of the oven and roll them back and forth to evenly incorporate it.