Step 1

In a small saucepan, add the sugar, grapefruit juice, water, and zest.

Step 2

Bring to a simmer and cook until the sugar has dissolved, about 4-5 minutes.

Step 3

Remove from heat and cool.

Step 4

Optional: strain the zest from the simple syrup for a smooth simple syrup without any chunks.

Step 5

Note: this can be made 1-5 days in advance.

Step 6

In a large pitcher, combine simple syrup, wine, and vodka.  Add strawberries and grapefruit slices.  Refrigerate for 2-4 hours.

Step 7

Add the club soda, serve, and enjoy!