Finally everything was in place to start the earth oven itself! We had four bags of sharp sand which was pretty much all we needed – though I did later learn that our oven mix had too much clay and more sand would have meant less cracking!
I started off by making a 22.5″ diameter circle using a tape measure and pencil. Sand was piled upto and a little over the edges and tamped down. Fortunately the sand was pretty wet from the bags and we didn’t need to wet it further to keep its structure.
Usually you’d then add wet newspaper, but it was so windy any attempt to stick newspaper to the dome failed. We put clay directly over the sand, firming down rather than squashing it onto the dome which would have dented the sand form.