Preheat your oven to 350°F (175°C). Grease and flour a loaf pan or line it with parchment paper.

In a mixing bowl, cream together the butter and sugar until fluffy (about 3 minutes).

Add the eggs one at a time, mixing well after each addition.

In another bowl, whisk together the flour and baking powder. Gradually mix this into the wet ingredients while alternating with milk.

Stir in the pink lemonade concentrate and lemon zest until well combined.

Pour the batter into the prepared loaf pan and bake for 50-60 minutes or until a toothpick comes out clean. Allow to cool before serving.