Careys Lemon Drop Cookies

Ingredients

• 1/2 cup unsalted butter one stick
• 1/4 cup Shortening
• 1/4 cup Sour cream
• 3 cups Granulated sugar
• 1 tablespoon lemon zested
• 3 Egg yolks
• 1 tablespoon Lemon juice
• 1/2 teaspoon Vanilla
• 1 teaspoon Baking soda
• 1 teaspoon Cream of tartar
• 1 dash salt
• 1 3/4 cups All-purpose flour
• 2 cups Powdered sugar sifted
• 2 tablespoons Cold water
• 1 teaspoon Lemon juice or extract