Wash the strawberries and remove the leaves and hulls. Cut larger berries into halves or quarters.
Put the strawberries in a saucepan and add the sugar. Juice the lemon and add the juice to the pan.
Bring to a gentle simmer, stirring all the time. The strawberries will release their juice and this will combine with the sugar to make a thick syrup. This takes about 5–10 minutes.
Take off the heat and blitz with a stick blender until completely smooth. If you don't have a stick blender, you can use a jug blender.
When you are happy with your coulis, use immediately or transfer to a storage container, cover and store in the fridge once cold.
