My cousin said, the ideal white wine to go with Mussels are Sauvignon Blanc. We only have some high end Riesling with us (too wasted to use it), 2 bottles of white wine we got from last years travel to Franken (romantic road) and 2 bottles of very, very precious wine produced in Switzerland. Its very precious because Switzerland keeps it for themself and you hardly can find a bottle outside the country. I selected a bottle of Chardonnay, half going to the pot and the other half for good drinking.
The cooking process was fairly quick! And taste was superb too! I will give this another try soon, and perhaps I should go stock up on some Sauvignon Blanc just for this purpose.
MIL´s gift ... :-D