Mix 50g caster sugar and 2 egg whites in a bowl, toss through 40g cranberries to coat, and do the same with the herbs. Leave somewhere warm to set, on a sheet of baking parchment. Heat the oven to ...

Tip the frozen mixed berries into a medium-sized round or square baking dish (you want a snug fit) and toss them with the remaining 50g of caster sugar. Scatter the crumble mixture on top and bake ...