Cut the butter into pieces and blend with all the ingredients into a green butter, taste and season if necessary.
If you don't have a blender, finely chop the garlic and parsley and mix with the rest in soft butter.
Take a piece of aluminum foil and scoop the butter onto it in the middle.
Fold the top side towards you and press the butter into a sausage shape, roll it up and twist the ends tightly, each in the opposite direction to make a firm sausage, let it set in the refrigerator for 1 hour.
Pat the scallops dry with some kitchen paper and place 3 per person in the shells.
Cut slices of 3 mm and place a slice of herb butter on each scallop.
Grill them briefly and powerfully in hot air with grill mode, for 7 to 8 minutes at at least 230°C or higher, until nicely gratinated.
Serve immediately with slices of bread.