Preheat oven to 300 degrees.
Grease and flour a large Bundt-style or ring pan.
In a large mixing bowl, add 3 egg yolks, one at a time, beating well after each addition.
Add the sugar and beat until light and fluffy.
Set aside.
In a separate bowl, beat 3 egg yolks, one at a time, beating well after each addition.
Add the butter and beat until white in color.
Combine both mixtures in a single bowl.
Stir together flour, nutmeg and salt until well mixed.
Gradually add to batter, mixing well.
Soak the raisins in the bourbon and roll the finely chopped nuts in a little flour; stir into batter.
In a clean bowl, beat the 6 egg whites.
Gently fold the beaten whites into the batter.
The batter should be thick and heavy, but a small amount of water can be stirred in if needed to make a batter which can be stirred smoothly.
Bake in a 300 degrees oven for 30 minutes, then reduce heat to 275 degrees and bake for 2 to 2 1/2 hours or until cake has begun to pull away from the side of the pan.