Slice the onion and sauté in the cooking oil. Add the crushed garlic and cook for one minute longer. Add the turkey mince and stir whilst cooking, until browned slightly then add the tinned tomatoes, add more water if you want more sauce.
In the meantime cook the penne in boiling water until al dente. In the last few minutes, add the torn basil leaves. Serve the turkey and sauce over the cooked pasta.