double boiler

You can use a double boiler over low simmering water, or you can place a large cup, like a glass measuring cup, in the simmering water — either works.

In a double boiler, melt butter along with finely chopped white parts of green onion and shallot, if using.

If you have a double boiler, set that up with water in the bottom.

You can melt it back out in a double boiler if you feel the need.

This deeply decadent, fudgy chocolate cake takes just five ingredients and 20 minutes; no sifter, stand mixer, or double boiler in sight.