flowerbug
Garden Master
i'd avoid doing things "under oil" as you've been describing it. generally this might be ok for items kept cold or frozen but sometimes people leave things out longer than they should.
anything that isn't going to be kept cold or in an acid enough environment or promptly eaten should be pressure canned, fermented (to get the acid from lactobacilli) or have other acidifiers added to it. when i put up garlic in the freezer i make sure to add some lemon juice to make sure the ground up garlic is going to be ok. you can use other acidifiers like apple cider vinegar, lime juice, orange juice, etc.
the basic problem with oil is that it may create an anaerobic environment and at room temperature that becomes home for C. botulinum bacteria...
anything that isn't going to be kept cold or in an acid enough environment or promptly eaten should be pressure canned, fermented (to get the acid from lactobacilli) or have other acidifiers added to it. when i put up garlic in the freezer i make sure to add some lemon juice to make sure the ground up garlic is going to be ok. you can use other acidifiers like apple cider vinegar, lime juice, orange juice, etc.
the basic problem with oil is that it may create an anaerobic environment and at room temperature that becomes home for C. botulinum bacteria...