Nickel Allergy Friendly Paleo Braised Lamb Shanks

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  4 lamb shanks (about 1 lb / 450g each)
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  1 ½ tsp kosher salt
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  1 tsp black pepper, freshly ground
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  3 tbsp olive oil, divided
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  Ingredients can vary. These products likely fit a Nickel Allergy diet.

  Filippo Berio Olive Oil 25.3 fl ozFilippo Berio Olive Oil 50.7 fl ozBertolli Cooking Olive Oil 50.72 ozPompeian Olive Oil Classic Mediterranean - 16 Fl. Oz.Vigo® 100% Pure Olive Oil

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  2 medium carrots, peeled and cut into 1-inch pieces
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  2 stalks celery, cut into 1-inch pieces
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  1 medium yellow onion, roughly chopped
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  4 cloves garlic, smashed
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  2 tbsp tomato paste
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  1 can (14 oz) diced tomatoes
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  2 cups bone broth
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  2 tbsp red wine vinegar
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  2 sprigs fresh rosemary
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  3 sprigs fresh thyme
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  1 bay leaf

For serving

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  2 tbsp fresh flat-leaf parsley, chopped (optional)