Prep the berries. If using fresh blackberries, rinse and pat dry. If using frozen, no need to thaw completely—just measure the amount you need.

Make the blackberry compote. In a small saucepan, combine blackberries with 2–4 tablespoons sugar (start low), a pinch of salt, and 1 teaspoon lemon juice. Cook over medium heat for 4–6 minutes, stirring and lightly smashing the berries as they soften. You want a saucy mixture with some texture.

Taste and adjust. Add more sugar if the berries are very tart, or a touch more lemon if they’re especially sweet. The compote should taste bright and slightly tangy, not cloying.

Cool the compote. Transfer to a bowl and let it cool to room temperature. For faster cooling, spread it on a plate and chill for 10 minutes in the fridge. Cool fruit is key so it doesn’t deflate the cream.

Whip the cream. In a chilled bowl, whip the heavy cream with vanilla and 1 tablespoon sugar until it forms soft peaks—cloud-like, not stiff. This texture folds better and stays tender.

Fold in the berries. Add about two-thirds of the cooled blackberry compote to the cream. Gently fold 3–4 times to create ribbons. Do not fully mix; the swirled look is part of the charm.

Layer and swirl. Spoon the mixture into glasses or small bowls. Top with small dollops of the remaining compote and lightly swirl with a spoon for a marbled finish.

Chill briefly. Refrigerate for 20–30 minutes to set the texture and let flavors mingle. It’s ready to serve after this short rest.

Garnish and serve. Add fresh blackberries, a sprinkle of lemon zest, crushed shortbread, or a mint leaf. Serve cold and enjoy.