Watermelon and strawberry ice-block

1.Combine water and white sugar in a small saucepan; stir over low heat until sugar dissolves. Bring to the boil; boil, uncovered, about two minutes or until mixture thickens slightly. Transfer syrup to small bowl; refrigerate until cold. Blend or process cold syrup with watermelon, strawberries and lemon juice until smooth. Pour mixture into four ice-block moulds. Freeze overnight or until firm.