Active learning ideas
This topic explores the science behind cooking with carbohydrates, specifically focusing on starch and sugar. Students investigate the processes of gelatinisation, dextrinisation, and caramelisation. These chemical and physical changes are what give food its texture, flavor, and color, such as the thickening of a sauce or the browning of toast.
Activity 01
Students test different starches (cornflour, potato starch, plain flour) to see which creates the clearest and thickest gel at a specific temperature. They record observations and present their 'best starch' recommendation for a fruit glaze.
What happens to starch when heated in liquid?
Activity 02
Set up stations for caramelisation (heating sugar) and dextrinisation (toasting bread). Students observe the changes in color, smell, and taste at different time intervals, noting the point where 'flavorful' turns to 'burnt'.
How does sugar change when subjected to dry heat?
Activity 03
Students are given a scenario of a failed white sauce. They must individually identify the scientific reason for the lumps (gelatinisation gone wrong), discuss with a partner, and share a foolproof prevention technique.
Why do baked goods turn brown?
A few notes on teaching this unit
Watch Out for These Misconceptions
Caramelisation and the Maillard reaction are the same thing.
Caramelisation involves only sugar, while the Maillard reaction requires both protein and sugar. Hands-on comparison of heated sugar versus a glazed chicken wing helps students see and smell the difference.
Starch thickens a liquid as soon as it is added.
Starch requires heat and liquid to reach the gelatinisation point. A 'live' heating demonstration where students measure temperature against viscosity helps correct this misunderstanding.
Methods used in this brief
Properties of Proteins in Cooking
Study the effects of heat, acids, and mechanical action on proteins. Observe processes like denaturation and coagulation in everyday cooking.
8 methodologies
Properties of Fats and Oils
Analyze the functional properties of fats and oils, including aeration, shortening, and emulsification. Understand their role in food texture and flavor.
8 methodologies