Bring the strawberries, sugar and water to the boil, simmer for approx. 10 mins. until the fruit is soft. Puree the strawberries, simmer for a further 3 mins. Pour the contents of the pan through a jelly bag or fine sieve, drain well, do not squeeze out. Return the liquid to the pan, add the lemon juice, bring to the boil.
Pour the syrup through a funnel into bottles that have been rinsed in hot water, seal immediately, leave to cool.