Place chocolate in a 2-quart casserole.
Microwave at MEDIUM 3 to 4 minutes.
Stir in sugar to make a paste.
Add water, molasses, milk, and salt.
Stir to blend well.
Microwave at HIGH 6 to 7 minutes or until bubbly hot, but not boiling.
Stir well at 2 minutes intervals.
Pour into mugs and serve hot
Blend cocoa and sugar in a small bowl. In a medium saucepan, heat milk to scalding. Mix about 1/3 cup of the hot milk into the cocoa-sugar mixture, then pour cocoa mixture into hot milk in the saucepan; stir until well blended. Stir in vanilla. Serve with mini marshmallows. Serves 4.