Place the caster sugar, chopped strawberries and lemon juice together in a bowl and leave for about 15 minutes until the sugar dissolves.
You can then mash them up or use a hand held blender to puree the strawberries before the next step. This depends if you like larger pieces of strawberries in your ice cream.
You can take out about 2 tablespoons of strawberries before you blend it to add back a bit of texture.
You can beat the double cream and fold it into the bowl of blended mixture along with the yoghurt and strawberries which you saved earlier.
Pour the mixture into an ice cream maker and churn for about 20 - 25 minutes, checking on consistency as you go.
If it is not frozen enough, you can transfer into a freezer proof container and freeze it for a couple of hours before serving.
Serve with fresh strawberries or other toppings of your choice.