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1
In a large enameled cast-iron casserole, cook the bacon over moderately high heat, stirring occasionally, until the fat is rendered.
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2
Add the onion, celery and diced carrots and cook, stirring occasionally, until beginning to soften, about 8 minutes.
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3
Add the beans, cover with water and bring to a boil.
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4
Reduce the heat to moderately low and simmer the beans until al dente, about 20 minutes.
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5
Remove from the heat, add a generous pinch of salt and let stand for 30 minutes.
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6
Drain the beans, bacon and vegetables and transfer to a bowl; reserve 2 cups of the cooking liquid.
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7
Meanwhile, preheat the oven to 350.
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8
In a small skillet, toast the cumin, coriander and mustard seeds over moderate heat, shaking the pan, until fragrant and the mustard seeds begin to pop, 3 to 5 minutes.
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9
Transfer to a spice grinder and let cool.
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10
Add the smoked paprika and crushed red pepper and grind the harissa blend into a powder.
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11
Wipe out the casserole and heat 2 tablespoons of the olive oil in it.
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12
Add the merguez and cook over moderate heat, until lightly browned all over, about 5 minutes.
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13
Transfer to a plate.
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14
Do not wipe out the casserole.
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15
Add the sweet potatoes, turnips and large carrots to the casserole.
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16
Season with salt and black pepper and cook over moderately high heat, stirring occasionally, until the vegetables begin to soften, 5 minutes.
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17
Add the harissa spice blend and cook until fragrant, about 2 minutes.
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18
Stir in the bean mixture and the reserved 2 cups of cooking liquid and bring just to a simmer.
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19
Arrange the merguez on top.
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20
Cover and bake the cassoulet for about 1 hour, until the beans are tender and most of the liquid has been absorbed.
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21
Remove from the oven and uncover the cassoulet.
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22
Preheat the broiler.
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23
In a bowl, toss the bread, parsley, lemon zest and the remaining 3 tablespoons of olive oil; season with salt and black pepper.
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24
Sprinkle the bread over the cassoulet and broil until golden and crisp.
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25
Let the cassoulet stand for 10 minutes before serving.
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26
Pass yogurt at the table.