this post was submitted on 05 Nov 2024
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Not sure about the jar portion. But the caramelization process is a bit complicated. It uses free sugars and amino acid to make the brown, caramelized flavour.
Onions are ~9 % carbohydrates with 4 % of that being simple sugars capable of caramelizing. Apparently another 2 % is fibre, leaving ~3 % being more complex carbohydrates I guess? Like cellulose or starches maybe. Those can get broken down at some points, but as far I know, need enzymes to do so.
But back to your question, if the small glasses are showing "sugar" as in sucrose, the onions could have either sucrose maybe? Or individual sugars such as glucose and fructose (the 2 components of sucrose). There's a number of other single sugars that could make up that 4 % though.
Very interesting, thanks