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1
Rub chicken with salt & pepper and let stand for 10 minutes.
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2
Place 1 tablespoon of the olive oil in a heavy shallow flameproof casserole or saute pan than can hold the chicken in a single layer and heat over medium-high heat. Working in two batches, brown the chicken all over, about 5 minutes per side. Transfer the browned chicken to a bowl.
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3
Add the remaining 1 tablespoon of the olive oil to the pan and reduce the heat to medium-low. Add the onion and cook, stirring occasionally, until it is limp but not browned, 5-7 minutes. Add the garlic and cumin and stir for 30 seconds. Add the sherry, increase the heat to high, and cook until the sherry is slightly reduced, about 1 minute. Add the bitter and regular orange juices and bring to a simmer. Return the chicken to the pan, cover it, reduce the heat to low, and simmer for 15 minutes.
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4
Add the orange zest, tomatoes, olives, and parsley. Continue to cook the chicken over low heat, covered, turning it once or twice, until very tender, about 25 minutes.
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5
Meanwhile, peel the oranges with a small sharp knife, removing all the white pith. Working over a sieve set over a bowl, cut in between the membranes to release the orange sections. Carefully stir the orange sections into the stew and cook until heated through, about 5 minutes.
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6
Transfer the chicken to a serving bowl, spoon the pan juices and olives over it, sprinkle the mint on top and serve.