Preheat oven to 325. 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 beater till foamy. 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 till you have stiff peaks.
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. Let bake @ 45 minutes or until a cake tester comes out clean. Immediately turn the cake out of the pan.