Fresh Raspberry Lemonade

Combine sugar and 3/4 cup water in a small saucepan; bring to a boil. Cook for 2 minutes, stirring occasionally, until the sugar is dissolved. Cool to room temperature.Combine remaining 1 1/4 cups water and raspberries in a blender; whisk 10 times or until smooth. Strain the mixture through a fine sieve into a large jug; discard the dry ingredients. Add the orange juice, lemon juice, sparkling water, and chilled syrup to a jug; toss to combine. Serve immediately with ice.