You cant get much easier than this
6oz Dark Cooking Chocolate
3 Large Eggs, seperated
1tbs Rum or Orange Juice (optional)
1/4pt Double Cream
Melt the chocolate in the microwave carefully. When cooled a little add the 3 egg yokes.
Whisk the egg whites until stiff, and then gradully fold them gently into the chocolate mixture.
Server well chilled.