Heat the olive oil and butter in a pan, add the spring onions and cook gently for 2-3 minutes.
Add the garlic and fry for another minute. Add the seafood and saffron, along with its soaking liquid, and cook for 2-3 minutes. Stir in the hot cooked pasta and mix well to coat.
To serve, place the seafood pasta into serving dishes and sprinkle over the grated parmesan.