Cook the tagliatelle in boiling water according to packet instructions.
Whilst the pasta is cooking, heat the oil in a pan and add the prawns. Cook for 3-4 minutes. Once cooked, add the curry paste and tomatoes and cook for a further 3-4 minutes. Stir in the soft cheese and heat through until you get a creamy consistency.
Drain the pasta and add to the pot with the prawn sauce. Mix well and serve hot, garnished with the chives and chilli (if using).