In the list of ingredients for the vibrant green dressing, the single egg yolk might seem like a minor component, but it plays an absolutely essential role. Skipping it would fundamentally change the character of the sauce, and here’s why it’s so important.
The egg yolk is a powerful natural emulsifier. It contains lecithin, a substance that helps to bind oil and water (in this case, the lemon juice) together into a smooth, stable mixture. Without it, your dressing would be thin, separated, and oily rather than thick and creamy.
Beyond its technical function, the egg yolk also contributes to the flavour and richness of the dressing. It adds a subtle savoury depth and a velvety mouthfeel that you can’t replicate with other ingredients. It’s what gives the sauce its luxurious, mayonnaise-like quality.
So, when making this dressing, treat the egg yolk as a non-negotiable ingredient. It is the secret to achieving that perfectly creamy, rich texture that makes the sauce—and the entire salad—so special.