I would like to be able to can and sell my own sauces (brown gravy sauce, chile paste sauce). There isn't much acid in the recipe of the chile paste, and Mason Jar for pressure canning is cost prohibiting in my country. Is there any other way to preserve my food products and make it shelf stable? Can I use the jar as on the picture if I were to use boiling-water canning?
Best Answer
There is no way at all to do that.
If you made up your own recipe, pressure canning is out of the question. It is only safe for recipes which have been developed and tested with pressure canning in mind.
Water bath canning is generally also only advised with recipes which have been developed and tested for canning, in order to ensure that you have both the proper acidity and proper thermal behavior. If you have the skills and tools to measure pH, you might decide to go with that and do water-bath canning of your own recipes with testing each batch before and after canning. This might do it for you personally, but 1) you will have to develop recipes that taste pretty sour (which you don't want to), 2) you will still have to use proper canning jars (as answered to your previous questions, both pressure and water bath canning require Mason or Weck style jars, jars with twist-off lids as in your picture are not safe) and 3) if you are selling, your local food safety authority might not agree that it is safe just because you say you measured it.
The only feasible storage option available to you as a home cook is freezing, which makes it almost impossible to operate as a cottage food producer - you would have to ensure that the jars stay frozen the whole time until they reach the customer and the customer would have to consume them within 3-5 days of defrosting, plus it is likely to mess with the texture of some sauces.