Key Lime Pie

INGREDIENTS

• 1 1/4 cups all-purpose flour
• 1/4 tsp. salt
• 1 tsp. sugar
• 6 Tbs. (3/4 stick) cold unsalted butter, cut into 1-inch pieces
• 1/4 cup shortening
• 2 to 3 Tbs. ice water, or as needed
• 5 eggs
• 7 egg yolks
• 3/4 cup sugar
• 2/3 cup milk
• Pinch of salt
• 1/2 cup Key lime juice
• 12 Tbs. (1 1/2 sticks) softened unsalted butter,
• cut into 1-inch pieces
• 4 egg whites
• 1/2 tsp. vanilla extract
• 1/4 tsp. cream of tartar
• 1/3 cup sugar