The low-acid ingredients, and why you cannot add more
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What the guidance actually says
The published salsa and sauce guidance is explicit: altering the proportions of low-acid ingredients in a tested recipe changes whether it is safe. Not whether it is nice. The acid you add has to be enough for the low-acid material it is acting on, and adding more of that material without adding acid moves the finished product up toward and past the threshold.
Which ingredients are the low-acid ones
- Onions, peppers, garlic and other alliums and vegetables.
- Meat or stock, where a recipe has it.
- Dairy, in a creamed sauce.
- Tomatoes, which are closer to the line than people expect and are the reason tomato products carry their own acidification instruction.
The place this actually bites
Scaling a recipe up, and seasoning to taste at volume. A cook adjusts by instinct and the instinct is good; it is just that the adjustment is now a regulated change. The discipline to learn is that flavor development happens during formulation, and production hits the formulation.
This is also why a second sauce is a second filed process rather than a variation. There is no such thing as the same product with more chili in it.
Tomatoes deserve their own warning
Tomato products sit near the threshold naturally and the published guidance carries explicit acidification rates for them. A pasta sauce is therefore not a safe product because tomatoes are acidic; it is a safe product because it was acidified to a measured figure. Those are different claims and only one of them is true.
Where this constrains the menu
It means the chunky, vegetable-heavy sauce that sounds most appealing is also the hardest case: more low-acid material, more acid needed, more particulate for the acid to penetrate, and a thicker product for heat to travel through. None of that makes it impossible, but the ambitious first product is the expensive one to get filed, and a simpler sauce first is a cheaper way to learn the regime.