Make this lemon lime slush recipe when you are in the mood for a really refreshing cold citrus drink.
Combine boiling water and sugar in blender and stir until dissolved. Place the blender into the refrigerator to cool the water.
Once cooled, remove from the refrigerator and add lemon zest, lemon juice, lime zest, lime juice and ice.
Blend on high speed about 30 seconds until slushy.
Serve with the lemon and lime slices.