Lentil loaves may conjure notions of the hippie-led vegetarian movement of the 1960s and 1970s, but meatless loaves actually became popular much earlier, when beans and legumes were promoted as a nutritious and cheap alternative to meat during World War II. Though it might seem retro, a lentil loaf is sometimes regarded as a rite of passage for new vegetarians, a nourishing meal that is budget friendly and largely made from pantry ingredients. W…