Preheat the oven to 350°F (180°C) and grease a 10 x 4.5-inch (25×10 cm) loaf tin.
In a large bowl, whisk the eggs and sugar until pale and fluffy.
Sift in the flour with the baking powder, stirring well.
Add the melted butter, orange juice and zest, and stir well.**
Pour the batter into the loaf tin and bake for 40 minutes, or until a toothpick inserted in the center comes out clean. Allow the pound cake to cool completely before serving.***
