Put the ground beef in a large pot, such as a 4 to 5-quart Dutch oven. Set it over medium heat and cook the ground beef, breaking it up into clumps, until it’s no longer pink. This’ll take 5 to 8 minutes. Drain off and discard most, but not all, of the fat. Add the beans and canned tomatoes to the pot. Stir and let it come to a simmer.