In a large bowl, whisk the double cream to form stiff peaks.
Add the crushed meringues, sliced strawberries and raspberries to the cream and gently fold through.
Next layer the ingredients into either serving dishes, or jam jars if you are planning a picnic. First spoon in some cream, then pour over a drizzle of berry puree. Repeat this process another couple of times so that you have nice layers of both the cream mixture and the berry sauce.
Once finished either cover and place the dishes in the fridge. Alternatively if filling jam jars, pop on the lid, place in your cool bag and head out for your picnic.
Shop bought meringue nests work great in this dessert. Don't go giving yourself extra work making your own meringues. The whole point of this dessert is that it is quick to prepare. If you don't have any berry puree (shop bought works just fine here too), take a few extra berries and blitz them up using a hand blender.