What is a Double Boiler?
Quite simply it’s a bowl floating in boiling water!
You can buy a Double Boiler that is made for the job but to be honest all you need is a pan & a glass bowl that can withstand being boiled. I like to use a Pyrex Bowl as cheaper makes can often crack when in contact with boiling water.
The main use for a double boiler is to melt ingredients that you don’t want to get scolded by direct heat.
Quite simply you partially fill the pan with water and put it on the stove on a low heat then float the glass bowl in the water.
Now just add your ingredients and depending on the melting point you will either need to bring the water to a boil and let it simmer or just wait until the ingredients have melting to the required consistency.