First lets do the beurre manié. Combine the flour and the room temperature butter in a mixing bowl using a fork until it forms a thick “paste”. Reserve
Put the mussels in a strainer and run them quickly under cold water. If there are any “beards” on the mussels remove them
In a large pot, melt the cold butter over medium heat then add the shallot. Cook for 2 minutes and add the white wine. Add the mussels in, cover and bring to a boil. Cook for 6-7 minutes.
Make sure to stir the mussels 2-3 times to ensure even cooking
Remove the mussels and put them in a bowl
Strain the mussels juice and reserve.
Don’t strain all the juice, leave like a tablespoon or so at the bottom. You will avoid getting sand in your juice.
In a pot, bring to a boil the mussels juice and add half the beurre manié. Stir stir stir. If after about 30 seconds it’s still too liquid, add some more beurre manié and stir it in. Note the texture should be between liquid and a thick liquid
Stir and add the lemon juice and the cream
Give a taste test and adjust with pepper
Dress the mussels on your plate and cover them with the sauce
Sprinkle with fresh chopped herbs
Notes
If you cook with the cheapest wine available, your meal will taste cheap. This doesn’t mean you need to use a 35$ bottle either. Use a good wine for the recipe then drink the remaining wine 😉