Southern Green Beans

Place the chopped bacon in a skillet, and cook over medium heat, stirring occasionally, until evenly browned, 8 to 10 minutes. Drain the bacon pieces on a paper towel-lined plate.
Melt the butter in a skillet with a lid over medium-low heat, and cook and stir the onion until translucent, about 5 minutes. Stir in the cooked bacon, green beans, potatoes, garlic, and chicken broth. Bring to a boil, cover, and simmer over low heat until the green beans are tender, about 10 minutes. Sprinkle with vinegar, salt, and pepper, and serve.