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Heat the oil in a large pressure cooker over medium high heat.
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Sprinkle the beef all over with salt and pepper.
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Add the beef to the pot and cook until brown all over, about 12 minutes. Transfer the beef to a plate.
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Reduce the heat to medium and add the shallots to the pot.
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Sauté until the shallots are golden, about 2 minutes.
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Add the carrots, celery, and garlic and sauté for 3 minutes.
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Add the wine and vinegar and simmer until the liquids are reduced by half, stirring to scrape up any browned bits on the bottom of the pot, about 5 minutes.
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Stir in the beef stock, thyme, rosemary, bay leaves, and juniper berries. Return the beef to the pot.
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Place the lid on the pressure cooker and raise the heat to medium high until pressure starts to build in the cooker.
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Once the cooker has reached desired pressure, reduce heat to medium or low, just enough to maintain steady pressure.
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Braise until the beef falls apart with a fork, about one to one and a half hours.
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Turn the heat on the pressure cooker off and carefully release the pressure from within the cooker by slightly lifting the ‘pressure limiting valve’. (NOTE: This will create a large amount of steam, be careful as the steam can burn you.)
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After all pressure has been removed from the cooker, wait for the ‘safety open-preventing’ valve to release before trying to remove the lid. Let the beef rest uncovered in the braising liquid for 15 minutes.
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Transfer the beef to a carving board and cut into thick slices or pull the beef apart into large chunks.
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Arrange the beef on a platter, spoon some braising juices over the beef, and serve.