This is rich and beautiful. It makes me incredibly happy to have a scoop of beautiful chocolate and a scoop of beautiful vanilla next to each other. I don’t like ice cream to be too sweet, and the chocolate you use will be important in determining the amount of sugar. Use the best-quality chocolate you can buy. You might even like to try this one day with a couple of spoonfuls of cocoa powder stirred in for an even richer hit of chocolate. Save the whites in the freezer for pavlova or meringues — you never know when you’ll need them.