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1
Trim the tops and bottoms from the fennel bulbs, reserving a handful of the fronds for garnish.
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2
Quarter the bulbs.
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3
Set each quarter on its side and slice off most of the core.
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4
Cut the quarters into wedges about 1-inch thick (don't worry if some pieces fall off the wedge-use those too).
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5
Put 1/4 cup oil in a large skillet with a tight-fitting lid.
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6
Place over medium-high heat until almost smoking.
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7
Add the fennel and cook without stirring until fennel is brown on the bottom, about 5 minutes.
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8
Stir and let the fennel continue to cook until some more pieces brown, 1 to 2 minutes.
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9
Add 1/2 cup water to the skillet, scraping up any browned bits from the bottom.
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10
Sprinkle with 1/2 teaspoon of salt and several grinds of pepper.
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11
Lower the heat to medium, cover the skillet, and cook 5 minutes.
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12
Sprinkle the cod with salt and pepper and place on top of the fennel.
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13
Cover the pan again and simmer, adding more liquid occasionally if the pan is dry, until the fennel is very tender and the cod is cooked through, 5 to 7 minutes.
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14
Meanwhile, chop the reserved fennel fronds (you should have about 1 1/2 to 2 tablespoons) and remove the zest from the lemon.
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15
Heat the remaining 2 tablespoons of oil in a medium skillet over medium-high heat.
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16
Add the breadcrumbs and cook, stirring frequently, until the breadcrumbs brown, 2 to 3 minutes.
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17
Remove from the heat, season with salt and pepper, and allow to cool.
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18
Mix the fennel fronds and lemon zest into the breadcrumbs until combined.
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19
Juice the lemon.
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20
Roughly chop the olives.
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21
When the cod and fennel are done, stir in the lemon juice and the olives.
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22
Remove from the heat and let stand for about 1 minute to warm the olives.
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23
Transfer the fennel and cod to serving bowls and top the fish with the toasted breadcrumbs.
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24
Pour any remaining pan juices over the fennel.