I am not a huge fan of marmalade, but Kirill likes it. So we had a go at making it. The recipe came from this page; I will post it here with my remarks lest the page disappears. First remark is that is should be called marmalade, and not “jam”, as it contains peels.
4 lemons (ours were medium-sized)
Juice of one lemon, strained (recipe says 2 tablespoons, but lemon I used only gave about 3, so it all went in)
1 cup sugar (my favorite cup holds 260 ml)
4 cups water