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1
Preheat oven to 325 degrees F (165 degrees C). Generously season lamb shanks with salt and black pepper.
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2
Heat vegetable oil in a large Dutch oven over medium-high heat. Place lamb shanks in the Dutch oven, cook, turning, until browned on all sides, about 10 minutes. Transfer shanks to a plate. Drain off remaining oil and fat so only 1 tablespoon remains in the Dutch oven.
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3
Stir onion, garlic, and a pinch of salt into the Dutch oven; decrease heat to medium-low and cook, stirring, until onions are softened and translucent, about 5 minutes. Add tomato paste, chipotle chile powder, ancho chile powder, and ground cinnamon; stir to combine.
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4
Pour 1 cup chicken broth over onion mixture. Increase heat to high; when liquid boils, place lamb shanks in Dutch oven. Cover and cook in the preheated oven for 90 minutes.
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5
Remove Dutch oven and stir in jalapeno pepper, red bell pepper and 1/2 cup chicken stock; bring to a boil on the stovetop. Return pan to the oven and cook, uncovered, until lamb shanks are fork tender, about 20 minutes. Transfer lamb to plate.
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6
Place Dutch oven on the stovetop over high heat; bring liquid to a boil and cook, skimming off any foam, until liquid is reduced and thickened, about 5 minutes. Stir in cilantro; season with salt and pepper to taste. Spoon sauce over lamb shanks and serve.
