Dark & Stormy Cupcakes

Name: Dark & Stormy Cupcakes
Prep time: 30 min
Cook time: 45 min
Total time: 1 h 15 min
Yield: 6 cupcakes
Ingredients: 1 cup flour; 1/4 cup sugar; 2/3 cup ginger beer; 1/4 cup butter, at room temperature; 2 tablespoons dark rum or 2 teaspoons rum flavoring; 1 egg, at room temperature; 2 teaspoons mccormick ground roasted ginger; 1 teaspoon baking powder; 1/4 teaspoon salt; 1 cup sugar; 1/4 cup dark rum; 2 egg whites; 3 inches knob ginger, sliced; 1 pinch salt