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I make an oil and lime based dressing that everyone loves and says I should sell. I am having a hard time finding out the requirements to safely preserve the dressing for resale. There has to be a method or there wouldn't be oil and vinegar dressings on store shelves.
I don't want to contact a manufacturer/distributer yet because I'd like to see how well it does on a small scale at farmers markets before I pay manufacture/distribution costs.
You can't reasonably create a shelf-stable lime juice and oil dressing in a home kitchen.
Oil and vinegar dressings don't really need much to preserve them because both oil and vinegar are shelf-stable on their own.
Lime juice, however, degrades at room temperature, so you would need to sterilize it in a hot water bath. That's pretty simple; lime juice is extremely high acid, so 10 minutes at 180F will do it.
However, that brings up a second problem: hot water bath canning anything containing a lot of oil is not recommended. There's some problems with canning anything containing a lot of oil:
Moreover, because home canning with oil is officially not recommended, it's very hard to find any reputable advice on how to do it. This means you'd be experimenting ... not just with your recipes, but with the health of your customers, which is very risky in most places.
However, there is another option. Many small producers sell dressings that need to be refrigerated and consumed within a few weeks; I have a feta-cheese based dressing from a local cheesemaker in my fridge right now. You could experiment in your own fridge to see how long it keeps. Consider this as your path forwards for selling your dressing.
