1 1/2 cups (190 grams) all-purpose flour
2 teaspoons baking powder
1/2 teaspoon kosher salt
1 cup (230 grams) plain whole-milk yogurt
1 cup (200 grams) plus 1 tablespoon (13 grams) sugar
3 extra-large eggs
1 tablespoon grated grapefruit zest (approximately one large grapefruit)
1/2 teaspoon pure vanilla extract
1/2 cup (120 ml) vegetable oil or olive oil
1/3 cup (80 ml) freshly squeezed grapefruit juice

For the glaze:
1 cup (120 grams) confectioners’ sugar
2 tablespoons (30 ml) freshly squeezed grapefruit juice