INGREDIENTS
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2 tablespoon unsalted butter
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1/4 cup extra-virgin olive oil
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1 small white onion, sliced 1/2 inch thick
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1 9-ounce box frozen artichoke hearts, thawed and pressed dry
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1/4 pound shiitake mushrooms, stems discarded and caps quartered
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2 carrot, cut into 1/2-inch pieces
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2 clove garlic, thinly sliced
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1 15-ounce can chickpeas, drained
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1 cup chicken stock or low-sodium broth
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salt and freshly ground pepper
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2 tablespoon chopped flat-leaf parsley
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2 tablespoon snipped chives
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4 6-ounce skinless cod filets
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lemon wedges, for serving