Scrub mussels thoroughly, make sure they are clean an free of sand.
In a saucepan, bring shallots, butter and white wine to a simmer. Add mussels to mixture and cover. Turn them gently so that the mussels are evenly heated. Simmer until all mussels are open, about 7 - 8 minutes. Bring wine mixture back to a boil, add the cream, salt and pepper to taste and lemon juice.