Preheat oven to 350 F. Grease and flour a 9x5 loaf pan. Tap out the excess flour. In a large bowl, whisk together eggs, salt and sugar for about a minute just until the mixture is bubbly. Add the grated zest and whisk together.
Combine flour and baking powder in another bowl. Sift about 1/3 of the flour mixture into the egg mixture. Whisk by hand using a wire whisk to combine. Sift the flour mixture in two more additions. Whisk just until everything is combined. No need to overdo it.
Whisk in the heavy cream. Switch to a rubber spatula and fold the melted butter. Pour the batter into the loaf pan. Bake in the center rack of the oven for 50-60 minutes. A toothpick inserted at the center of the cake should come out clean. The top should crown and crack. Transfer to a wire rack and let the cake cool slightly in the pan. Remove from the pan and let cool completely.
Recipe adapted from the book, Baking with Julia by Dorie Greenspan. Recipe by Norman Love.