This is not authentic, so don't come whining to me about me not having a clue. It is true. But there is a Catalan dish called fideua which is like a paella but with noodles instead of rice. I was going for that sort of effect.
Sautee some sliced chorizo in a heavy-based saucepan. When the chorizo starts to crisp and give off a lot of lovely red oil, add a bag of thawed seafood mix. As soon as the prawns begin to pink, remove the chorizo and seafood from the pan and set aside.
Add a diced onion to the saucepan, sautee in the chorizo/seafood juices until translucent, then add a can of diced tomatoes and some pasta. I used about 100g orzo, but something bigger would work better, I think. Add a cup of vegetable stock (I used a liquid vegetable stock concentrate and steeped a pinch of saffron threads in it). When the pasta is almost tender and has absorbed most of the liquid, add the reserved chorizo and seafood back to it and cook for another couple of minutes (stirring frequently because it catches like a bastard). I had some slightly fatigued basil in the fridge, so I finished the dish with a chiffonade of basil, but it didn't really add anything.
Serve with a lightly dressed green salad. Very filling!