2 c. cold pink grapefruit juice
1/4 c. frozen tangerine concentrate, thawed & undiluted
2 tbsp. fresh lime juice
6 pink grapefruit ice cubes (recipe follows)
1 c. cold seltzer
Lime slices to garnish

In a glass measuring cup, combine grapefruit juice, tangerine concentrate and lime juice, stirring to blend. Pour into two tall glasses, dividing evenly. Add three ice cubes to each glass. Add seltzer, dividing evenly. Garnish with lime slices.