"This is a fresh, incredibly savory way to cook mussels with loads of garlic, onions, fresh herbs, spices and a light tomato lemon twist. Dish up in bowls with rice, pasta, or just crusty bread and a side salad."
Melt butter in a large pot over medium heat. Add onion and garlic; cook and stir until softened, about 5 minutes. Add tomatoes, celery, vermouth, lemon juices, lemon slices, hot sauce, thyme, paprika, cayenne, and black pepper. Simmer until flavors combine, about 20 minutes.
Stir mussels into the pot. Simmer, covered, until mussels have opened, about 2 minutes.