Place the berries into your large mixing bowl. Mash them well with a fork or masher. You want a thick and chunky fruit puree.

Stir in the caster sugar and lemon juice. Let the mixture sit for ten minutes now. This helps the juices come out of the fruit.

Push the fruit through a fine-mesh sieve gently. Discard the seeds left behind in the sieve. Keep the smooth red liquid in the bowl.

In a separate bowl, pour the cold double cream. Whip it until soft peaks start to form. Do not over-mix or it will turn buttery.

Fold the strawberry puree into the whipped cream. Add the condensed milk to the bowl slowly. Stir gently to keep the air inside.

Pour the pink mixture into your freezer container. Smooth the top with the back of a spoon. Place the lid on the container very tightly.

Put the container in the freezer for six hours. Over-night freezing is even better for the texture. Scoop and enjoy your homemade frozen treat.