Add 1/2 of lemon juice and 1/2 of lime zest and mix till fluffy.
Add eggs one at a time. Mix together.
mix together flour,baking powder and salt and add to sugar mixture. Mix well.
Add in mountain dew and 1/2 lemon and 1/2 lime juice.Mix till blended.
Fill greased muffin cups 2/3 full. Bake at 350 degrees for 18-20 minutes or until golden brown.
ICING: 1 cup butter, 4 cups powdered sugar, 2 tablespoons of mountain dew, half of lemon and lime juice from cupcake recipe, half of lemon and lime zest from cupcake recipe. RECIPE: Beat butter and half of the sugar. Add mountain dew,zests and lemon and lime juice and mix well. Add remaining sugar till the sweatness you desire. Frost when cool .Keep regrigerated.