This grapefruit drink, unlike lots of fruity cocktails, is low on sugar if made with Truvia. Just mix about three tablespoons of it in warm water to make Truvia simple syrup, and add to your drink.
1.5 oz. grapefruit juice
.5 oz. simple syrup
1 basil leaf
2.5 oz. Champagne brut
Garnish: grapefruit twist and basil leaf
Add all ingredients in a shaker and fill halfway with ice. Shake, then double strain into a glass and garnish.