Combine strawberries, sugar, lemon juice and vanilla in a medium saucepan and bring to a boil. Lower heat to a gentle simmer until the strawberries are soft and the syrup is thickened and reduced by ⅓ to ½ in volume, approximately 15 minutes, stirring occasionally.
Syrup will thicken upon standing so simply whisk in more water to reached desired consistency if needed.
