Triple-Citrus Sheet Pan Shortbread | The Fancy Pants Kitchen

Ingredients

• 1 & 1/2 cups unsalted butter, softened
• 1 cup granulated sugar
• 2 tsp tightly packed grapefruit zest
• 2 tsp tightly packed lime zest
• 2 tsp tightly packed orange zest
• 4 cups (500 grams) all-purpose flour
• 1/4 cup cornstarch
• 3/4 tsp kosher salt, divided
• 2 cups confectioners’ sugar, sifted
• 2 tbsp unsalted butter, melted
• 1 tbsp fresh grapefruit juice
• 1 tbsp fresh lime juice
• 1 tbsp fresh orange juice
• Garnish: grapefruit zest, lime zest, orange zest