It's just sauteed onions and garlic with beans (soaked overnight) and boiling water added in. Season it with thyme, parsley, a bay leaf, and salt and pepper, and then just let it simmer until the beans are cooked, which for me took about an hour and a half.
Unfortunately, this just wasn't all that interesting, flavor-wise. I'll finish it, but I'm not excited about it. Well, at least it was cheap.
onion -- $.55
Total Cost of Mediterranean Bean Soup: $.55
($.14 per serving)