We associate Christmas with traditions, flavours and aromas that repeat themselves year after year. Cabbage soup, desserts, wafers, potato salad and homemade pastries are perceived as part of our cultural heritage. However, we are less aware that these seemingly simple culinary tasks are based on precise chemical and physicochemical processes.
One of the oldest and most typical Christmas dishes in Central Europe is kapustnica, a soup made from sour cabbage. Its production is a prime example of fermentation – specifically lactic acid fermentation. In this process, bacteria convert the sugars in cabbage into lactic acid. Chemically speaking, this is an anaerobic metabolic process that lowers the pH of the environment, thereby suppressing the growth of undesirable microorganisms and creating a characteristic sour taste.
Fermentation is therefore not only a preservation method, but also a process that fundamentally changes the chemical composition of food and creates new sensory properties – taste, aroma and texture – without which cabbage soup would be unimaginable.
Sweet pastries, desserts and Christmas wafers owe their colour and aroma mainly to the caramelisation of sugar. This process occurs when sugar is heated to higher temperatures without the presence of proteins. The carbohydrate molecules break down under heat and then reorganise into complex aromatic compounds that give the pastries their typical “Christmas” aroma and golden brown colour.
Mayonnaise is an emulsion – a mixture of two immiscible liquids, oil and water. The key ingredient is egg yolk, which contains emulsifiers, especially lecithin. These substances have both hydrophilic and hydrophobic parts, which enable them to “bind” oil droplets with the aqueous environment.
Chemically, this involves stabilising the dispersion system, which guarantees the creamy consistency and stability of the mayonnaise. Without this process, it would separate into individual phases.
Egg white meringue is an integral part of many Christmas desserts. But have you ever wondered what a pinch of salt actually does when whipping egg whites? Why is it so important? It’s not just a culinary habit – it’s a small but precisely targeted chemical phenomenon. Salt affects the way proteins bind together and form hydrogen bonds, keeping the foam stable, firm and less prone to collapsing. It’s a delicate balance between chemistry, physics and the right whipping technique.
We use similar “hidden chemistry” when leavening dough. Baking powder or baking soda reacts with the acidic components in the dough and releases carbon dioxide, which creates bubbles and increases the volume of the dough. Just like the air bubbles in whipped egg whites, these gas bubbles make baked goods light and fluffy.
Both processes prove that even small ingredients and simple steps in the kitchen are the result of precise chemistry.
Christmas baking and cooking prove that chemistry is not some distant laboratory science, but a natural part of everyday life. Every spoonful of mayonnaise, every piece of cake or plate of cabbage soup is the result of complex chemical processes that together create the taste of Christmas. And that is precisely where its magic lies – in the combination of tradition, taste and molecular precision.
Ing. Mária Zajičková, PhD., organic chemist, science populariser
Sources used:
1. Belitz, H.-D., Grosch, W., Schieberle, P. Food Chemistry. Springer, Berlin, 2009.
2. Tamang, J. P., Kailasapathy, K. Fermented Foods and Beverages of the World. CRC Press, 2010.
3. McGee, H. On Food and Cooking: The Science and Lore of the Kitchen. Scribner, 2004.
4. McClements, D. J. Food Emulsions: Principles, Practices, and Techniques. CRC Press, 2015.
5. Damodaran, S., Parkin, K. L., Fennema, O. R. Fennema’s Food Chemistry. CRC Press, 2017.
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