From: "The Bean Cookbook" by Norma S. Upson (1982). Hearty and filling. Brown rice usually takes about 45 minutes so I'm including that in the cooking time. *If you would like some heat or a chile flavor consider adding tabasco, jalapenos or diced mild green chilies. I just made this with salsa instead of tomatoes and added black pepper. I was very pleased with the results. A simple flavored hearty meal. I'm used to mexican dishes having cumin and it may work with this but I liked it being different and it may appeal to people who don't like cumin. I think black olives and bell pepper would be good in it too. Some people may also want to add layers of cheese but I was really surprised at how good it was without it. To cut down the fat more you could cook the onions with the ground beef and skip the butter.