Tuna Pasta Salad

Ingredients
- 1 red onion, finely chopped
- Juice of 2 lemons
- Salt
- 1 pound medium shell pasta
- 1/4 cup flat leaf parsley
- 1 palmful Italian seasoning
- 1/3 cup extra virgin olive oil (EVOO)
- 2 cans pole-caught, salt-free tuna, drained
- 2 ribs celery, finely chopped
- 1 can cannellini beans