Use each lime wedge to run the rims of each glass. Add the coarse sea salt to a small plate and coat each glass rim with salt.
1 lime, made into 2 slices and 2 wedges, Coarse sea salt
Squeeze the remaining lime juice from the lime wedges into each glass along with the liquid sweetener. Fill each glass halfway with ice and place a slice of lime and grapefruit in each glass.
1 lime, made into 2 slices and 2 wedges, Ice cubes, enough to fill each glass halfway, 2 tsp liquid sweetener, 1 grapefruit, made into 2 half-slices and 2 quarter-slices
Pour in the grapefruit juice, top with the sparkling water, garnish with the quarter slices of grapefruit, and serve!
2 cups grapefruit juice, 2 cups sparkling water, 1 grapefruit, made into 2 half-slices and 2 quarter-slices