Chop the chocolate into small, even pieces
Place the chocolate in a dry, heatproof bowl
Melt over a double boiler with the bowl set above simmering water
Stir gently until smooth
Remove from heat before fully melted and let residual heat finish the job
Or microwave in short intervals, stirring between each one
Stop heating as soon as the chocolate is mostly melted
Stir until completely smooth
Keep all water away from the chocolate
Use immediately or keep warm gently until needed