Place the raspberries and 2 Tbsp of the sugar in a small pan. Cook on a medium heat until sugar dissolves. Simmer for 5 mins until thickened, then push through a sieve into a bowl. Refrigerate until completely cooled.
Add yolks and remaining sugar to a medium bowl and whisk until pale then set aside.
Add milk and cream to a medium saucepan and heat on high until simmering then remove from heat.
Scoop out around a cup of milk from the saucepan and slowly pour into the yolks - all the while whisking. Once combined, pour yolks into the saucepan of milk and continue heating on a low heat until it thickens enough to coat the back of a spoon. Pour into an airtight container and refrigerate overnight or until completely cooled.
Pour into an ice cream maker and churn as per manufacturer's instructions. As the ice creams hardens, swirl in the raspberry.
Scoop ice cream into an airtight container and freeze for 2-3 hours.