Clean the mussels  and preheat the oven to 230ºC. Put the mussels in a pan with some water and when they open remove them from the water one at a time. Discard the empty shells, leaving the mussels in the other half. Blend all the other ingredients in a bowl, then put the mixture in a pan and heat slightly until it begins to soften. Place the mussels on a baking tray, spoon a small amount of stuffing into each mussel and bake for about 8 minutes, or until the top is lightly browned.
Serve hot.