Add the crushed tomatoes, both types of beans, the frozen corn and the beef broth. Give it a good stir and bring the whole thing to a gentle simmer.
1 can (14 oz / 400g) crushed tomatoes
1 can (14 oz / 400g) red kidney beans
1 can (14 oz / 400g) black beans
½ cup frozen sweetcorn
4 cups beef broth