In a small pot, combine ¼ cup sugar and ½ cup water.

Bring to a boil, stirring constantly until sugar is dissolved.

Add raspberries and cook for 1-2 minutes, until raspberries are completely dissolved.

Set aside to cool {you may add ice to accelerate this process}.

Strain off raspberries from sugar/water syrup if desired.

Combine syrup with lemon juice, limoncello, and cold water.

Serve over ice.