Complete protein or not, you can get your sulfur-containing amino acids 32oz of tofu or 6oz of turkey (less of both if you're smaller), and other vegan sources

Complete protein or not, you can get your sulfur-containing amino acids 32oz of tofu or 6oz of turkey (less of both if you're smaller), and other vegan sources are significantly worse, so a properly varied diet has higher demands. It's not impossible, but it's not as easy as just replacing all your animal proteins with equivalent masses of plant proteins either.