Topping:
Just mix with a spoon if you don’t have a cake mixer. Melt chocolate slowly and make sure no water touches the chocolate as this may cause it to seize (small hard lumps). Use a metal or glass bowl and metal spoon as wooden spoons and plastic bowls retain moisture that may cause the chocolate to seize. When melting chocolate over a saucepan of water, make sure the bowl fits tightly and the water is only simmering on low. If there is a lot of steam it can drop into the chocolate causing it to seize.