No oil. I actually froze it for making a quick garlic oil on demand as a home cook. Garlic oil is not something to make at home and store as it's not really safe unless used fairly quickly. Which is not a feature of most home cooking. But I could take a couple of cloves and thaw in a few seconds in the microwave and make a pleasant mellow garlic oil from them very quickly.
This was something I picked up from Helen Witty in her The Good Stuff Cookbook which I think quite highly of.
Granted, here in the pro forum, you have different scales of operation.