Preparation

• Preheat oven at 300 degrees.
  Butter the inside of 10 3 1/4 -or 4-by 1-inch rings.
  Use empty 6-oz pineapple cans, with tops, bottoms, and labels removed or use circles of same diameter. Set rings on a buttered baking sheet.
  Melt chocolate on low heat or in double boiler. Set aside to cool. Cream the butter in an electric mixer. Beat in the cooled chocolate.
  In a large bowl, beat the egg yolks with 6 teaspoons sugar until lemony colored. Beat in the chocolate mixture.
  Beat egg whites with cream of tartar to form soft peaks. Add the remaining 2 teaspoons sugar and beat at high speed to hold soft peaks. Fold in the chocolate mixture.
  Fill rings 1/2 full. Recipe can be made 3 hours ahead to this point.
  Bake 15 to 20 minutes. Set baking sheet on a rack to cool. After 10 minutes.
  Twist rings and remove from the tortes.
  Transfer to dessert plates. Dust with sugar. Serve with ice cream. Drizzle with bittersweet chocolate sauce.
  Bittersweet chocolate sauce:
  In a medium saucepan, combine 5 oz bittersweet chocolate with 1 1/4 cups warm water. Melt chocolate on low heat.
  Away from heat, whisk in 2 teaspoons sweet butter. Cool and refrigerate.