Set bowl over a pan of simmering water, and stir gently until sugar has dissolved and mixture is warm to the touch, about 2 to 3 minutes. (thegourmetreview.com)
Melt the chocolate and butter in a bowl set over a pan of simmering water until smooth and all of the chocolate is melted. (guittard.com)
Place the bowl over a pan of simmering water until the butter and chocolate are melted, then remove the bowl from the heat. (suma.coop)