Cream the butter and sugar until light. Add the salt and egg yolks. If you have a blender, put the rind into it with the buttermilk and whirl it until the rind is very fine. Stir the rind mixture into the sugar mixture.
Sift the flour, baking soda and baking powder together and blend into the batter. Fold in the nuts, then the stiffly beaten egg whites. Pour the batter into a buttered bundt pan or tube pan.
Bake at 350°F for about 50 minutes.
Heat the orange juice in a saucepan. When the cake comes out of the oven, drizzle the hot juice over it with a spoon.
Cool before slicing.
Notes
Orange Glaze Icing
If you want to make a glaze for the cake, use icing sugar, enough orange juice to moisten it and a drop of almond flavoring. Make the mixture thin enough that you can drizzle the icing on top of the cake and let it run down the sides.