If you can't find any fresh mussels in your neck of the woods, buy the frozen kind instead; these are widely available at most supermarkets and they thaw relatively quickly. They also cook quickly, perfect for weeknight meals. Here the mussels are sauteed with onion, mushrooms, bell pepper, and cabbage, then chopped tomatoes and sliced crab sticks are toss in and the dish is ready for serving, in a flash of the pan.