1 (12 fluid ounce) can or bottle Irish stout beer (such as Guinness®)
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2 onion, cut in half and sliced
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1 large garlic clove, crushed
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4 slices smoked streaky bacon, sliced into strips
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1.5 cups fresh button mushrooms
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salt and ground black pepper to taste
Instructions
Preheat slow cooker on Low.
Heat 2 teaspoons oil in a skillet over medium-low heat and cook shallots until they are lightly browned, 5 to 10 minutes. Place in the slow cooker. Add beef to the same skillet and cook until meat is seared on all sides and browned, about 5 minutes. Add flour and mix well. Pour in beer and bring to a boil. Transfer beef-beer mixture to the slow cooker.
Wipe out the skillet with a paper towel and add remaining 2 teaspoons oil. Add onion and cook until soft and translucent, about 5 minutes. Add garlic and bacon and cook for 1 minute more. Transfer to the slow cooker. Add mushrooms and season generously with salt and pepper. Cover.
Cook on Low until meat is cooked through, about 5 hours.