1 (12 fluid ounce) bottle dark beer (such as Guinness®)
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2 cups chicken broth
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3 carrots, cut into 1-inch pieces
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2 stalks celery, cut into 1-inch pieces
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0.25 cup chopped fresh flat-leaf parsley
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3 tablespoons balsamic vinegar
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12 Brussels sprouts, halved
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3 cups mashed potatoes, or as needed
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1 teaspoon chopped fresh flat-leaf parsley, for garnish
Instructions
Season pork with salt and black pepper.
Heat oil in a large pot over high heat. Working in batches, cook and stir pork in hot oil until browned on all sides, 5 to 10 minutes. Transfer pork to a bowl.
Melt butter in the same pot over medium heat. Cook and stir onion in hot butter with a pinch of salt until onion is softened and translucent, 7 to 10 minutes. Add garlic; sauté until fragrant, about 30 seconds.
Stir flour into onion mixture; cook and stir until flour is completely incorporated, about 2 minutes. Add bay leaf and caraway seed; cook for 2 minutes more. Pour in beer. Cook and stir until thickened, 1 to 3 minutes.
Stir browned pork, broth, carrots, and celery into beer mixture; bring to a simmer. Stir 1/4 cup parsley and balsamic vinegar into stew; reduce heat to medium-low and simmer until pork is fork-tender, about 2 hours.
Meanwhile, bring a large pot of lightly salted water to a boil. Cook Brussels sprouts in boiling water until almost tender, about 5 minutes. Drain.
Stir Brussels sprouts into stew and simmer until heated through, about 5 minutes. Season with salt and pepper.
Divide mashed potatoes between 6 bowls. Ladle stew over potatoes and garnish with 1 teaspoon parsley.