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Mussel Gratin With Lemon And Parsley Butter

By colm
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Sweet, garlicky mussels topped with crisp breadcrumbs – if you reckon you don’t like mussels or have never tried them before then this classic recipe is sure to convert you.

mussel gratin

Given the name of this blog, I figured it’s about time I featured some of the ingredients the blog is named after. And there’s no better place to start than with this recipe… a classic crowd-pleaser.

Mussels have always been a poor man’s meal. Free food scavenged from the shallow, coastal water where they grow. I can still remember as a kid in short trousers picking them off rocks along Galway bay. Looking in rock pools and under seaweed was always much more fun than eating them. Nothing much has changed, mussels are still the most inexpensive seafood around. A kilo costs 4 euro at my fishmonger but you could definitely pick them up for less at one of the big supermarkets. We farm loads of them here in Ireland, along the north Atlantic coast, and there were 1.8 million tonnes consumed worldwide last year.

We’ve been eating mussels for thousands of years and legend has it that mussel farming was invented by Irish sailor Patrick Waltonun in 1235. When he was shipwrecked in a remote area of the French Atlantic coast he tried to survive by catching sea birds. He put some nets on top of long poles and placed them in the shallow water. He soon realised he was catching more mussels on the end of his poles than birds in his nets, and so mussel farming was born.

So its thanks to paddy that we have this cheap, sustainable, and tasty seafood available in abundance.

Mussel Cooking Tips

Cooking mussels takes just seconds, it’s the preparation that’s the time-consuming part. You’ve got to get rid of all that sand and grit. Which involves a bit of scrubbing and rinsing in cold water.

Don’t remove the beard (that’s the hairy bit sticking out of the mussel, pictured below left) until you’re about to cook them. It’s connected to the meat inside and pulling it out can damage that sweet, orange flesh.

mussel cooking tips

Cook the mussels in the broadest pan that you’ve got, and in one layer. You’ll be able to pick out the early openers and stop them overcooking.

To save yourself some time make sure your garlic butter is at room temperature, then you can just use a disposable piping bag to fill the mussel shells. If you don’t have a piping bag use a freezer bag with a little hole cut out of the corner…this makes the most tedious part of the recipe 10 times faster…..

garlic and lemon butter

If you’re having people over you could put the breadcrumbs on top and pop them in the fridge at this point. Then it’s just a matter of slipping them under a hot grill for a couple of minutes…its a great do-ahead dinner party dish.

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Mussel Gratin With Lemon And Parsley Butter

  • Prep Time: 15 minutes
  • Cook Time: 15 minutes
  • Total Time: 30 minutes



For the garlic butter

  • 150g (5.3 oz) butter
  • 5 cloves garlic (chopped)
  • zest and juice of half a lemon
  • 25g (1.5oz) parsley

For the mussels

  • 1 tablespoon of olive oil
  • 2 finely diced shallots
  • 1 bay leaf
  • 1kg Mussels
  • 150ml (.3 pint) white wine
  • 100g (3.5oz) breadcrumbs


  1. When you get back from the fishmongers put your mussels straight into some cold water. Give them a good scrub and remove any seaweed and barnacles. Discard any that are open, you don’t want to eat them because their already dead.
  2. Wash the mussels in several changes of cold water to get rid of all the dirt and sand. Check for any where one half of the shell rubs against the other and discard them too. They will make the others gritty when you cook the mussels.
  3. Pull off the beard (the hairy part that sticks out from inside the mussel) and give them one final wash,
  4. Cook the shallot on a low heat, without colour for 3/4 minutes.
  5. Add the mussels, bay leaf and give the pot a good stir.
  6. Then you pour in the white wine, turn the heat up full and give the pot a good shake.
  7. Place a lid on the pot and cook the mussels for about 3 minutes or on till they all open.
  8. Drain off the mussels, but keep the cooking liquor. Its full of flavour and you can freeze it and use it in a sauce later.
  9. Next you have to make the garlic butter. Simply combine the garlic, lemon zest /juice, parsley and butter together.
  10. When the mussels are cool enough to handle. Remove and discard the top shell.
  11. Line a baking tray with foil (saves on a bit of washing up later) and place the mussels inside.
  12. Spoon the butter into a disposable piping bag and pipe about a teaspoon of butter into each mussel shell.
  13. Top each mussel with a good sprinkle of breadcrumbs and cook under a moderate grill till golden.


  • Serving Size: 4 appetizer size portions

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