Put the berries into your food processor. Add the icing sugar and lemon juice. Add a small splash of water as well.

Pulse the machine until the fruit is liquid. Ensure there are no large chunks left. The mixture should look very bright red.

Place your sieve over a clean glass bowl. Pour the strawberry liquid into the mesh sieve. This part takes a little bit of time.

Use your spoon to push the liquid through. The seeds will stay inside the mesh. Scrape the bottom of the sieve often.

Discard the seeds left in the sieve. Your smooth sauce is now in the bowl. Transfer it into a small jar for serving.