12 servings (serving size: 1 slice)

How to Make It

Step 1

Preheat oven to 300°.

Step 2

Sift flour, 3/4 cup sugar, cocoa, and cinnamon together 3 times.

Step 3

Beat egg whites and cream of tartar in an extra-large bowl with a mixer at high speed until foamy. Gradually add remaining 1/4 cup sugar, beating until soft peaks form. Sift flour mixture over egg white mixture, 1 tablespoon at a time; fold in gently after each addition. Combine coffee granules and water. Fold coffee mixture and vanilla into batter.

Step 4

Spoon batter into an ungreased 10-inch tube pan; spread evenly with a spatula. Break large air pockets by cutting through batter with knife.

Step 5

Bake at 300° for 50 minutes or until cake springs back when lightly touched. Remove cake from oven; invert pan, and cool completely. Loosen cake from sides of pan, using a narrow metal spatula; remove from pan.

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