Heat oven to 325 degrees F. Butter a tube pan with Pam (oil/ butter spray).
Coat the bottom and sides of the pan with ground almonds. Set aside.
In a large grease-free bowl, beat the egg whites with an electric mixer
Add the salt and the cream of tartar. Beat on high speed until the egg whites
form into soft peaks.
Add almond extract.
Gradually add the sugar. Beat until peaks are stiff.
With a rubber spatula gradually and delicately fold in the flour. Spoon
the batter delicately into the tube pan. Sprinkle the top of the batter with
the sliced almonds and place immediately in the preheated oven.
Bake for 45 minutes or until a cake tester comes out clean.