To keep calories in check, we like to use seltzer along with juice in drinks like vodka and cranberry. This version gets a raspberry twist with cranberry-raspberry juice and raspberries for garnish. For the prettiest garnish, start with big, plump fresh raspberries and freeze them yourself.
If using fresh raspberries, freeze them in a single layer for about 1 hour (or overnight) before proceeding with Step 2.
Combine cranberry-raspberry juice, seltzer, lime juice and vodka in a pitcher. Divide among 4 ice-filled glasses. Garnish with frozen raspberries and lime wedges.