Yield: 6 Servings
Source: Torah Prep High School for Girls Passover booklet
Mix coffee and boiling water; add milk.
Stir potato starch, sugar and salt in top of double boiler. Slowly stir in milk mixture; add chocolate.
Place over boiling water; stir until blended (about 4 minutes). Cover; cook for another 10 minutes, stirring occasionally. Pour into a serving bowl; cool.