Doenjang jjigae (된장찌개) is a staple Korean stew made with doenjang (된장), fermented soybean paste. It is one of the most popular everyday home-cooked Korean dishes.
Cut the tofu and zucchini into about 1-inch cubes. Cut the radish into thin small squares. Thinly slice the onion and pepper. Roughly chop the scallion. Slice the meat into thin strips.
Add the onion, garlic, tofu, zucchini, and chili pepper. Boil. Throw in the scallion pieces and add the optional vinegar with a minute or two remaining.