Soak the cleaned and debearded mussels in a bowl of cold water with 2 tbsp salt for 20 minutes.
Step 2
In a food processor, combine the parsley, dill, softened butter, fresh lemon juice, salt, and freshly ground black pepper. Blend until well combined. Add the breadcrumbs and pulse again until incorporated.
Step 3
Drain the mussels and steam them for 15 minutes, or until they open.
Step 4
Once steamed, open each mussel, keeping them on the half shell, and top each with a small spoonful of the prepared butter mixture.
Step 5
Place the topped mussels under a hot grill or use a blow torch to broil for 2 minutes, until the butter mixture is golden and bubbling.