01 -
Combine blackberries, granulated sugar, and lemon juice in a small saucepan. Cook over medium heat for 5-7 minutes, stirring occasionally, until berries soften and release juices.
02 -
Press mixture through a fine-mesh strainer to remove seeds. Let puree cool to room temperature.
03 -
Whip cold heavy cream with powdered sugar and vanilla extract until stiff peaks form.
04 -
Gently fold cooled blackberry puree into whipped cream until fully combined into a light, fluffy mousse.
05 -
Spoon or pipe mousse into serving dishes. Refrigerate for at least 2 hours until set. Garnish with fresh berries, whipped cream, and mint if desired.