Lemon and Elderflower Cupcakes - Food Duchess

Name: Lemon and Elderflower Cupcakes
Prep time: 20 min
Cook time: 18 min
Total time: 38 min
Yield: 18
Ingredients: 1/2 Lemon, Juice of; 2 Lemons, Zest of; 3 Egg whites, Large; 3 Eggs, Whole; 2 1/4 cups All purpose flour; 1 1/2 tsp Baking powder; 1 tsp Lemon extract; 1 Pinch Salt; 1 1/2 cups Sugar; 1/2 tsp Table salt; 1 1/2 tsp Vanilla; 1 cup White sugar; 3/4 cup Vegetable oil; 1 1/2 cups Butter, Unsalted; 1 cup Sour cream, Full Fat; 2 tbsp Elderflower liqueur