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Ingredients

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• 1 1/2 cups (195 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) granulated sugar
• 3 large eggs
• Finely grated zest from one large grapefruit
• 1/2 teaspoon vanilla extract (optional)
• 1/2 cup (120 ml) vegetable or another neutral oil
• 1/3 cup (80 ml) freshly-squeezed grapefruit juice
• 1 tablespoon (15 grams) granulated sugar
• 1 cup (120 grams) powdered sugar
• 2 tablespoons (30 ml) freshly squeezed grapefruit juice