Healthy seafood pasta recipe

Name: Healthy seafood pasta recipe
Prep time: 10 min
Cook time: 20 min
Total time: 30 min
Cuisine: European, Italian, Mediterranean
Ingredients: 2 tbsp olive or rapeseed oil; 1 small fennel bulb (160g), halved and thinly sliced; 1 onion (160g), finely chopped; 150g wholemeal spaghetti; 2 large pinches of chilli flakes; 3 garlic cloves finely grated; 1⁄2 lemon zested, plus 2 tbsp juice; 3 tbsp tomato purée; 300g frozen mixed seafood (we used a mixture of prawns, mussels and squid rings), defrosted; 3 tbsp chopped parsley