Ren from Fabulicious Food made hers with blackberry and white chocolate and I had just been blackberrying so I made mine with foraged blackberries and also used the Good Food recipe here. I plan to use the rest of my condensed milk to make fudge.
To make my blackberry swirl I heated up 100g blackberries with 50g sugar and let it simmer. When the blackberries had disintegrated I passed the mixture through a sieve and allowed to cool. I added this to my ice cream mixture.