Cook the pasta, drain and set aside. Draining with hot water will help keep the pasta separated.
In a fry pan add the buttery coconut oil, minced garlic and pesto. Stir fry for a minute and then add the prawns. Squeeze the lemon on top. Stir fry for a few minutes until the prawns are cooked through.
Add salt and pepper to season. Serve the spaghetti into bowls and mingle in the prawns. Add sliced lemons to finish.