Ingredientbeginnerdraft
Egg (whole)
Also searched as: eggs, whole egg, hen's egg

In short: The whole egg binds, lightens, emulsifies and adds colour. That is why it is in so many recipes.
Picture it
The Swiss army knife of the kitchen.
What Egg (whole) does
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What happens
Egg white binds and holds air; egg yolk emulsifies and adds richness. Together they give batters and doughs structure, colour and moisture.
What the ingredient does
binds when heatedProteins set (coagulation)
lightens as a foamFoams and whipping in air
combines fat and waterEmulsion
gives shine and colour as a glazeMaillard reaction
Rules of thumb
- Eggs at room temperature combine better with butter.
- For glazing, egg yolk with a little milk: a nice colour.
Sources · 1
- Harold McGee: On Food and Cooking (2004), Kapitel Gemüse, Eier