Yummy!!! Need to be a fan of grapefruit/tart citrus for this drink, which I am. I don't generally keep club soda on hand so I did substitute Sprite Zero, but other wise followed the recipe, which may have made a little sweeter, but I know I would like it with the soda, as I eat a half of a grapefruit almost every morning. I used fresh grapefruit juice, so not so pink in color. I loved the saltiness to the drink. Thanks for sharing. Made for PRMR Tag Game.