Add the bacon to a large Dutch oven and cook over medium heat until light golden (not crisp). Drain off the excess fat, and then add the onions. Cook until the bacon and onions are golden brown. Add the green beans and tomatoes to the pan. Sprinkle in salt, black pepper and cayenne pepper to taste. Stir gently to combine, and then and cover the pot and reduce the heat to low. Simmer for 1 hour.
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