Ziti with Tuna and Onion

Method

1. Slow cook the onions with a pinch of salt.
2. Cut the fresh tuna into thick cubes.
3. Add a splash of red wine vinegar to the tuna, then remove the tuna from the pan.
4. Continue cooking the onions with a ladle of water, fresh basil, and black pepper.
5. Cook the ziti pasta and add to the onion sauce for the final 2 minutes of cooking.
6. Turn off the heat and stir in plenty of Pecorino Romano cheese.
7. Serve and finish with fresh lemon zest.