When I went to uni my parents gave me a book called grub on a grant for Xmas in my second year. One recipe was a bean casserole made with tinned beans and tomatoes plus cheap stock items. I thought I could make it cheaper by cooking from dried beans, cooking from scratch. I used the pressure cooker but of course I didn't judge the quantities so well. Let's just say I was eating it for a week or perhaps more. You can have too many beans, but it was actually quite nice in the end.