Is French Onion Soup Sweet?

Category "Essay", 11. – 12. grade

Zhenya Petrova, 11th grade[1]

Supervisor: Mimi Dimova

“St. Kliment Ohridski” Secondary School – Dobrich (Bulgaria)

https://doi.org/10.53656/nat2025-3.09

Abstract. The paper explores the chemical nature of the transformation in onion flavour during thermal processing. The aim of the study is to explain how, through chemical reactions – particularly the Maillard reaction and caramelization – onions change their pungent taste into a sweet one. The author employs a popular science approach based on literature sources and an analysis of the onion’s components (sugars, amino acids, sulphur compounds, etc.). The main conclusion is that taste is the result of complex chemical interactions that give food new properties. In this context, the preparation of French onion soup becomes an example of applied chemistry, linking scientific knowledge, sensory experience, and culture tradition.

Keywords: onion; carbohydrates; Maillard reaction; caramelization; taste; food chemistry

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