In a medium saucepan, combine 1 cup of fresh blueberries with 1/4 cup of sugar and the juice of half a lemon. Cook over low heat for about 10 minutes, stirring gently until the blueberries burst and the mixture thickens to a jam-like consistency. Once done, remove from heat and let the compote cool completely before using it as the base for your stunning Blueberry Mousse.

In a blender, puree 1 cup of the remaining fresh blueberries until smooth. Pour this puree into a bowl and let it cool slightly. Meanwhile, in a small bowl, sprinkle 1 tablespoon of powdered gelatin over 2 tablespoons of cold water to bloom. After 5 minutes, gently warm the gelatin mixture on low heat until it dissolves, then stir it into the cooled blueberry puree until fully combined.

Place 1 cup of heavy cream into a chilled mixing bowl. Using an electric mixer, beat the cream on medium speed until soft peaks form, which should take about 3-4 minutes. Be attentive to avoid overwhipping; the cream should remain silky and smooth.

Take one-third of the whipped cream and gently fold it into the blueberry mixture using a spatula. Once incorporated, carefully fold in the remaining whipped cream until just combined, ensuring not to deflate the airy texture.

In individual serving glasses, layer the cooled blueberry compote at the bottom, then spoon the fluffy Blueberry Mousse on top. Smooth the surface with a spatula for an elegant finish. Place the assembled desserts in the refrigerator and chill for at least 4 hours.

After chilling, garnish your stunning Blueberry Mousse with additional fresh blueberries or a drizzle of lemon zest for added visual appeal. Serve chilled, and relish the light, velvety texture and sweet-tart flavor.