I made a bottle of basil sauce by myself last year summer. It composed of basil leave, extra virgin olive oil, pine nuts, garlic and parmesan cheese.
It was kept in a glass bottle in the refrigerator, and I've add some lemon juice on the top of the sauce to preserve it.
It should be rotting already right?
Best Answer
Last summer was a long time ago. The National Center for Food Preservation has this to say about herbs in oil:
Clostridium botulinum is a serious enough hazard with oiled herbs that I'd not trust a dash of lemon juice on top of the oil to protect me from getting sick after 9 months storage. You're much safer freezing the stuff as recommended. Ice cube trays produce nice pesto cubes that you can store safely in a freezer bag for at least a couple years.