Chocolate Fleck Cake (Torta de chocolate)

Assemble these supplies:

2 1/4 cups cake flour
1 3/4 cups sugar
3 teaspoons baking powder
1 teaspoon salt
1/2 cup olive oil
5 egg yolks
3/4 cup cold water
2 teaspoons vanilla
1 cup egg whites
1/2 teaspoon cream of tartar
3 squares unsweetened chocolate, grated

Steps in preparation: 

1. Sift the cake flour with the sugar, baking powder, and salt into a mixing bowl. 
2. Make a "well" in the center; add the oil, egg yolks, water, and vanilla to the well. 
3. Beat until smooth by hand or at lowest speed with a mixer.
4. Beat egg whites with cream of tartar until stiff Fold in flour mixture, then the grated chocolate. Pour into an ungreased tube pan.
5. Bake in a 325° preheated oven for 50 minutes. 
6. Raise the heat to 350° and continue baking about 15 minutes more or until cake springs back when lightly touched. Invert pan; allow to cool thoroughly. 
7. Loosen sides of pan with knife and invert onto cake plate.