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Ingredients
Method
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Fill a large bowl with cold water and tip in the mussels. Discard any that are cracked, broken, or that stay open when you tap them firmly against the side of the bowl. Pull away the beards by gripping them firmly and tugging toward the hinge end of the shell. Scrub the shells under cold running water if there is grit or barnacles clinging to them. Leave the cleaned mussels in fresh cold water while you prepare the rest.
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Set your largest, deepest pot over a medium-high heat. It needs to be big enough to hold all the mussels with room to stir. Add the rapeseed oil and the unsalted butter. When the butter foams, add the shallots and a pinch of salt. Cook for 4 to 5 minutes, stirring regularly, until they are soft and translucent but have not taken on any colour.
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Add the garlic and cook for a further minute, just until fragrant. Do not let it brown or the broth will turn bitter.
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Pour in the cider and raise the heat to high. Let it bubble for 2 minutes to cook off the sharp edge of the alcohol. The liquid should reduce slightly and smell mellow rather than raw.
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Drain the mussels and add them all at once to the pot. Put the lid on immediately and cook over high heat for 4 to 5 minutes, shaking the pot by the handle twice during cooking. The mussels are ready when the majority have opened. Any that remain firmly shut after 6 minutes should be discarded.
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Lift the mussels out with a slotted spoon or tongs into two warmed deep bowls, leaving the broth in the pot. Turn the heat down to low.
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Stir the crème fraîche and the Dijon mustard into the broth. Add the smoked butter and stir until it melts. Taste the broth: it should be savoury, lightly smoky, with enough acidity from the cider to cut through the cream. Adjust salt and pepper carefully; the mussels will already have contributed saltiness to the liquid.
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Ladle the broth over the mussels in each bowl. Scatter the chopped parsley over the top. Serve immediately with the sourdough bread alongside for soaking up the broth.
Irish Context
Irish waters produce mussels with a good, clean brine flavour, particularly rope-grown mussels from the west coast. The use of dry Irish cider in place of the more commonly seen white wine shifts the broth toward something less generic; Irish craft ciders tend to have a drier, more cidery quality than the sweetened variety and work particularly well with shellfish.
Smoked butter, produced by a small number of Irish creameries, has become more accessible in recent years and earns its place here beyond novelty.
Tips
Buy your mussels on the day you plan to cook them, or at most the day before. Store them in the fridge in a bowl covered with a damp cloth, never in an airtight container or submerged in water.
They need to breathe. Smoked butter is worth tracking down for this dish.
It shifts the broth away from the expected and gives the whole pot a faint, almost bacon-like depth without anything else needing to change. Plain butter works but the result is noticeably flatter.
If the broth tastes too sharp after adding the crème fraîche, a pinch of sugar will settle it. If it tastes flat, a small squeeze of lemon will bring everything back into focus.
Do not overcrowd the pot. If you are scaling up to serve four, use two pots or cook in two batches rather than cramming everything in.
Mussels steamed in an overcrowded pot cook unevenly and the ones on the bottom can go rubbery before the ones on top have opened. The bread is not optional.
Sourdough with a tight crumb holds up best against the broth. A loose, airy loaf will disintegrate before you have finished the bowl.
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