Place mussels in large bowl of cold water. Scrub the outsides of the mussels using a brush to clean them. Using a towel, remove the string (or “beardâ€) of the mussels. Discard any mussels that have opened already. Keep the mussels in the water and set aside. In a large skillet, melt the butter and heat the olive oil over medium heat. Add the diced onion and pepper and sauté for ~10 minutes, until the onions are translucent. Add the garlic and the ginger and cook for another minute. Add the spices, salt, and pepper and stir to incorporate. Add the stock and the coconut milk. Stir to combine and bring to a simmer. Simmer for ~5 minutes to thicken. Meanwhile, cook the noodles according to package directions. (I used udon noodles, which only take ~5 minutes to cook.) Add the lime juice and the mussels. Cover and cook for ~5 minutes, until the mussels have opened. Discard any mussels that have not opened. Serve the broth and mussels over the noodles in a bowl. Garnish with green onions. Enjoy!