INGREDIENTS
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1/2 cup (1 stick) salted butter
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2 medium onions, chopped
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1/2 teaspoon fennel seeds, crushed or finely chopped
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3 tablespoons all-purpose flour
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5 cups shrimp broth, bottled clam juice, or seafood broth (see Notes)
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1 cup water
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2 cups half-and-half
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1 1/2 pounds red-skinned potatoes, unpeeled, halved and sliced (about 4 1/2 cups)
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1 fennel bulb (about 8 ounces), halved and thinly sliced, plus 3 tablespoons chopped fennel fronds for garnish
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3/4 teaspoon table salt, plus more if needed
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2 pounds unshelled shrimp — either small Maine shrimp or any small or medium-size shrimp — or 1 1/2 pounds shelled and deveined shrimp
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1 teaspoon smoked paprika
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Freshly ground black pepper
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3 tablespoons Pernod (optional; see Notes)
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1/4 cup snipped chives