01 -
Throw the blackberries, sugar, and lemon juice into a small pot. Heat it on medium, stirring every now and then, until the berries soften and release their juices. This should take around 5–7 minutes. Strain the liquid through a fine strainer while pressing the berries with a spoon to get everything out. Discard the leftover seeds and let the liquid cool down before using.
02 -
Grab a big bowl and whip together the cold heavy cream, vanilla, and powdered sugar. Mix until stiff peaks form—it should look fluffy and hold its shape.
03 -
Take your blackberry mixture (now cooled) and gently fold it into the whipped cream. Do this slowly so the whipped cream stays airy and fluffy.
04 -
Scoop or pipe the blackberry mousse into small serving cups or bowls. Smooth out the tops if needed.
05 -
Let the mousse rest in the fridge for at least 2 hours so it sets. If you'd like, top with some fresh blackberries, whipped cream, or mint leaves before serving.