The butter with garlic and parsley: In a food processor, blend the butter, parsley, shallots, lemon juice, roasted garlic, and a pinch of salt and pepper until completely smooth.

Set the oven to 375 degrees Fahrenheit. Use an oyster knife to crack open the mussels. In tiny baking dishes lined with baguette pieces, distribute the oysters. Each mussel should have a generous teaspoon of butter with garlic and parsley. For 8 to 10 minutes, roast the oysters until the butter is dissolved. Serve right away.