Frozen berry yogurt
Ready In 5 mins
Cut up the blackberries and strawberries, toss together in a bowl with the caster sugar. Leave for 30 mins or until the fruit starts to break down, then mash a little with a fork.
Spoon the yogurt mixture into and swirl the berries through.
Place in a freeze-able Tupperware box
Place in the freezer for 2 hours.
Give the mixture a little stir and return to the freezer to firm up.