First take the lemons, cut them into halves and remove the seeds. Now squeeze out as much juice as possible into a bowl.
Next take water and castor sugar, add them in a saucepan and put it on low heat. Keep on stirring it until it turns into thin syrup. Leave it for five minutes and let it boil for sometime.
Now remove it from heat and let it cool down.
Once it completely cools down to room temperature, mix the lemon juice with this syrup. Now give this mixture a quick stir.
Add this mixture in an ice cream maker andfollow the manufacturer's instruction for further operation.
Finally take it out in an ice cream bowl and serve.