Cook the pasta

• Bring a large pot of salted water to a boil.
• Cook the spaghetti until al dente, then drain, keeping a little pasta water.

Sear the prawns

• Heat the olive oil and butter in a frying pan.
• Add the prawns and cook until pink and just cooked through, then set aside.

Build the sauce

• Add the garlic and chilli flakes to the pan and cook until fragrant.
• Pour in the cream and simmer gently.
• Stir in the parmesan, lemon zest and a splash of pasta water.

Combine and serve

• Return the prawns to the pan with the drained spaghetti and toss to coat.
• Season with salt, scatter with parsley and serve.