Sparkling Mock Margaritas

Juice of 4 limes (about 1/3 cup)
6 tablespoons fresh grapefruit juice
1/2 teaspoon salt
Ice
1 (1-liter) bottle lime-flavored tonic water
8 lime wedges, for garnish

Combine the lime juice, grapefruit juice, and salt in a large pitcher; stir until the salt is completely dissolved.
Fill 8 tall glasses with ice. Divide the juice mixture between the glasses; slowly fill each glass with tonic water. Garnish each serving with a lime wedge.

Note: To coat the rims of the glasses with salt, rub with a lime wedge. Pour a layer of coarse salt on a plate and press each rim into the salt. Let stand for up to 1 hour.

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