Preheat oven at 180 C / 350 F.
In a bowl, combine flour, sugar and bakingpowder. Rub in the cold butter until the mixture resembles wet sand. Pour inthe cream and mix until combined (Don’t overmix).
In a separate bowl, combine the mixed berries,sugar, cornstarch and lemon zest.
Transfer the berry mixture into a baking dishthen top with dollop of the crumble mixture. Brush over the crumble with a bitof heavy cream and sprinkle over raw sugar for the extra crunch.
Bake at 180C / 350F for approximately 30 minutesor until the crumble is golden brown.