Step 9:
Now I am fortunate enough to have an ice cream mixer. You don't need one, all you need is a large bin to put ice in and a container to mix the ice cream in. Add the heavy cream to the chilled custard from the last step and mix it well. Put the container you are mixing the ice cream in in the bin of ice. The two keys here are lots of ice, lots of salt on the ice, and keep that mixture moving! It doesn't have to be fast, just keep it from freezing solid.