- Bring a large pot of water to a boil, add pasta and cook according to packet directions until al dente.
- Heat oil in a fry pan, cook onion until soft.
- Add sliced chorizo sausage and cook for five minutes, stirring frequently.
- Stir in pesto sauce and halved tomatoes, simmer for 10 minutes.
- Drain pasta, return to pot, add pasta sauce and stir through.
- Serve in bowls sprinkled with torn basil leaves.