Not sure what you saw RinTinTin, but it said they used a boiling water canner.
Charring the veggies will not harm the recipe. Lowering the amount of vinegar and lime juice, or upping the amount of veggies will. It is important to follow quantities stated. Within the realm of veggies, you can vary the amounts as long as the whole amount remains the same e.g. less onion more pepper.
Remy
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