Surprisingly I used to eat veggie burgers when I worked in the field. We had a lab with a freezer and I would grab some patties out of there, grab a coarse mesh plate that we use to wash dirt samples, and a pot of water to go over a hotplate. I'd put the mesh over the pot, boil the water, and put the frozen patty on the mesh. Oh and I'd go out in the field first and collect a few large
dockweed plants and boil those at the same time as greens. I could put both greens (after being pressed with paper towel) and patty on some bread and have a sandwich right there. It got me through the day, because working so hard out there, alone, you need some backup food when you get hypoglycemic. I never ate the caterpillars that came with the greens, because there was alot of pesticide used out there and it tends to collect in fatty tissues over plant tissues and biomagnify.