I found this recipe typed on a yellowing sheet of paper tucked between the pages of a recipe book I bought at an estate sale. I love the flavors of coffee and chocolate together. A note added to the recipe states it has 119 calories per serving.
In a saucepan whisk together the evaporated milk, cocoa, coffee, 2 Tblsp. sugar, egg yolks, and salt until smooth. Cook on low heat, stirring constantly, until slightly thickened. This should take about 5 minutes.
Remove from heat and stir in vanilla extract. Pour mixture into a bowl, cover & cool for 1 hour.
When chocolate mixture is cool, beat egg whites in a bowl until foamy. Add remaining 1 Tblsp. sugar and beat until soft peaks form.
Stir one-fourth of the whites into chocolate mixture, then gently fold in the remainder.
Spoon into six glasses and chill at least two hours. Top with a dollop of whipped topping and a bit of grated chocolate if desired before serving.