This makes for a handy emergency dish, as it requires very few ingredients and I even used frozen prawns and frozen broccoli. Simply put some pasta shapes onto boil (I used rigatoni). Add the broccoli for the last 3 minutes of the cooking time. Now drain the pasta and broccoli, making sure to retain some of the cooking liquid seperately for later.
Return to the pan. Now add the prawns, a couple of tablespoons of creme fraiche, some freshly squeezed lemon juice (I used half a lemon for 2 adult-sized portions), and plenty of salt and pepper. Put over a low heat, stirring until hot. This is where you can add some of the cooking water back to the pan if the sauce is a little thick.
Stir through a fresh herb of you have some-I used basil, though I think mint or parsley would also work well.
Then just act super casual, like it's no big deal and "hey all 4 year olds eat seafood, chill out man", and see if your little one digs in..