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1
Mix cocoa and water together; set aside to cool.
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2
Sift flour, baking powder, baking soda and salt together; set aside.
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3
Cream butter with vanilla; gradually add sugar creaming thoroughly.
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4
Add egg yolks, one at a time, beating throughly after each addition.
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5
Add cocoa mixture and beat until well blended.
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6
Beating only until blended after each addition, alternately add dry ingredients in thirds and sour milk in halves to cream mixture.
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7
Fold in beaten egg whites.
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8
Turn batter into 2 prepared 9-inch layer cake pans and spread evenly to edges.
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9
Bake at 375 degrees (200 C.) 25 to 30 minutes, or until cake tests done.
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10
Cool in pan on a wire rack about 10 minutes.
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11
Then run spatula gently around sides of pan.
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12
Cover cake with wire rack and invert.
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13
Lift off pan and immediately turn cake right side up on wire rack.
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14
Cool completely.
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15
Fill and frost with frosting below.
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16
Combine all ingredients except vanilla in the top of a double boiler; beat with hand rotary or electic beater until blended.
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17
Place over boiling water; beat constantly until mixture will hold peaks.
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18
Remove from water; add vanilla.
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19
Beat until cool and thick enough to spread.
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20
For Seven- Minute Chocolate Frosting: Melt 3 ounces (3 squares) unsweetened chocolate and set aside to cool.
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21
Follow recipe above; blend in chocolate when mixture holds peaks.