Vanilla Cupcakes: Preheat oven to 350 degrees F (177 degrees C) and line 12 muffin cups with paper liners.

In the bowl of your electric mixer, or with a hand mixer, beat the butter and sugar until light and fluffy. Add the eggs, one at a time, beating well after each addition. Scrape down the sides of the bowl as needed. Beat in the vanilla extract and lemon zest.

In a separate bowl whisk together the flour, baking powder, and salt.

With the mixer on low speed, alternately add the flour mixture and milk, in three additions, beginning and ending with the flour. Scrape down the sides of the bowl as needed.

Fill the muffin cups with batter. Bake for about 18 - 20 minutes or until nicely browned and a toothpick inserted into a cupcake comes out clean. Remove from oven and place on a wire rack to cool. Once the cupcakes have cooled completely, cut a deep hole in the center of each cupcake, using a melon baller or the end of a large pastry tip. Fill each hole with a heaping teaspoon of lemon curd.

Lemon Curd: In a stainless steel bowl placed over a saucepan of simmering water, whisk together the eggs, sugar, and lemon juice until blended. Cook, stirring constantly (to prevent it from curdling), until the mixture becomes thick (like sour cream or a hollandaise sauce) (160 degrees F or 71 degrees C). This will take approximately 10 minutes. Remove from heat and immediately pour through a fine strainer to remove any lumps. Cut the butter into small pieces and whisk into the mixture until the butter has melted. Add the lemon zest and let cool. The lemon curd will continue to thicken as it cools. Cover immediately (so a skin doesnt form) and refrigerate until cold. The lemon curd can be made several days (up to a week) in advance.

Frosting: In a large mixing bowl place the whipping cream, vanilla extract, and sugar and stir to combine. Cover and chill the bowl and wire whisk in the refrigerator for at least 30 minutes. When chilled, beat the mixture until stiff peaks form. Spread frosting on each cupcake with a knife or spatula, or if you want to pipe the frosting, I like to use a large Wilton 1M star decorating tip.

If not serving the cupcakes immediately, cover and place in the refrigerator until serving time.

Makes 12 cupcakes