Preheat the oven to 375 degrees. Lightly grease 10 muffin cups. In the bowl of an electric mixer combine the butter and sugar and beat at medium speed until fluffy and well combined. Add the eggs one at a time beating after each addition. Beat in the yogurt and 1/3 cup lemonade syrup. The mixture will look curdled. Combine the flour, baking powder and salt and mix together. Add the dry ingredients to the butter mixture. Beat to blend ingredients thoroughly to a smooth batter. Spoon the batter into the prepared muffin tin. Bake for about 18-20 minutes or until a cake tester inserted into the center comes out clean. Remove from the oven and brush the remaining 3 tablespoons lemonade syrup over the tops of the cupcakes. Let cool. Frost and serve.

Lemonade Frosting

Cream the butter in an electric mixer at medium speed. Add 3 tablespoons lemonade syrup and the lemon peel and beat them in. Gradually add the confectioner’s sugar and beat until the frosting is smooth and well blended. Add more lemonade syrup if needed for spreading consistency.