double boiler
double saucepan

Cover the pot with a bowl of water (like a double boiler).

Place the chocolate in the top of a double boiler.

Combine all the ingredients in the top of a double boiler.

When ready to use, reheat in the top half of a double boiler.

When it has melted, remove the double boiler from the heat.

Keep warm in a double boiler, for no more than 15 minutes.

Melt the chocolate over hot water in a double boiler.

Bring water to boil in lower half of a double boiler.

Put the chocolate in the top of a double boiler over hot water, stirring often.

The butter went into the top of the double boiler.