Perfect Coconut Cupcakes

INGREDIENTS

• 1 cup sweetened, shredded coconut
• 1 1/2 cup unsalted butter at room temperature, cut into cubes
• 6 egg whites
• 1 tablespoon fresh lime juice (optional)
• 3/4 cups unsalted butter at room temperature, cut into cubes
• 1/4 teaspoon kosher salt
• Zest of one lime (optional)
• 2 1/4 cups cake flour (see note)
• 1 cup coconut milk
• 1 teaspoon vanilla extract
• 1/2 teaspoon kosher salt
• 2 teaspoons baking powder
• 1 1/4 cup sugar
• 1 1/2 cup sugar
• 2/3 cups coconut milk