Oooh, these do sounds good. Heres the recipe, on pg 137, just like you said!

Mocha Toffee Squares

1 cup finely crushed chocolate wafers
3 Tbs melted butter or margarine
2 tsp instant coffee crystals
3/4 cups sugar
1/2 cup margarine or butter
4 egg yolks
1 square (1 ounce) unsweetened chocolate, melted and cooled
1/2 tsp vanilla
4 egg whites
2 1&1/8 bars chocolate covered english toffee, crushed (1/2 cup)

For crust, combine crushed wafers and melted margarine, press onto bottom of 8x8x2 inch dish. Dissolve coffee crystals in 1 Tbs hot water. Beat together 1/2 cup sugar and the 1/2 cup margarine till fluffy. Add egg yolks, one at a time, beating well after each. Add coffee, chocolate, and vanilla, beat till combined. Beat egg whites to soft peaks; gradually add remaining sugar, beating to stiff peaks. Fold chocolate mixture into egg whites. Spread over crust. Sprinkle toffee atop. Cover, freeze 6 hours or until firm. Let stand 5 minutes before serving.