Mussels in wine garlic and tomato sauce - another 1/2 hour wonder

We went to Costco yesterday and they had this huge package of mussels for $10.00.  The girls and I love them and Andrew says they are too much work but really enjoyed them.
Mussels are inexpensive, fast and easy to make.  You can make less and serve them as a starter or make a lot (as I am) and have them for your meal.
I put them on the table in a big bowl.  Everyone gets a plate and a bowl for the spent shells.
We have a big crusty bread sliced and ready for sopping up all of the yummy sauce.
You can used diced tomatoes but as the girls don't like pieces of tomatoes in their sauce I am using crushed tomatoes.
Don't cook any mussels that are open before cooking and don't eat any mussels that are closed after cooking.
The mussels we buy at the supermarket (or Costco) are cultured and cleaned.   They just require a good rinse before cooking.
You can make the sauce ahead then heat it up and add the mussels just before serving

Mussels in Wine Garlic and Tomato Sauce
2 tablespoons olive oil
1 onion, diced
6 cloves garlic, minced
1 28 oz can crushed tomatoes
2 cups white wine
1 2" piece Parmesan rind (optional)
5 pounds fresh mussels

Rinse the mussels with cold water and discard any mussels that are open.
Heat a large stock pot on high.  Reduce to medium and add oil.  Add onions and sautuntil soft.
Add garlic and heat (do not burn)
Add tomatoes, wine and bring to a boil then add the mussels.
Cover for 5 -10 minutes - just until the mussels are open
Serve with crusty bread. (discard any mussels that are not open)