Mussels are one of the those dishes that should stay pretty simple in my opinion. Their flavor is so strong that I don't want to mess it up. I add olive oil to a large pan and put the stove on medium heat. I add one yellow onion, red bell pepper, and garlic. I cook this down for 5 minutes and then add the washed mussels. I pour some cheap but tasty Greek white wine over the mussels, add cherry tomatoes and cover. I cook everything for 5 minutes only, overcooking will make the mussels rubbery. If some mussels don't open, throw them away, it means they aren't good. Add to a bowl and toss with parsley and feta cheese. Enjoy!