What is caramelization?
Caramelization is what happens when sugar is heated until it breaks down into brown, nutty, slightly bitter flavor compounds, with no protein needed.
Why it works
Plain sugar melts and then breaks apart at about 320掳F (160掳C) for sucrose, forming new molecules that taste buttery, nutty, and a little bitter. The color deepens as the reaction goes on, and so does the bitterness. Onions and other vegetables contain sugar too, so slow heat lets their sugars caramelize and turn sweet and jammy.
How to do it
Common mistakes
- Walking away from melting sugar, which goes from amber to burnt in seconds.
- Cranking the heat on onions, which scorches the outside before the sugars develop.
- Stirring dry sugar too early, which can cause grainy crystals.
Questions about caramelization
How long does it take to caramelize onions?
It takes about 30 to 45 minutes on medium-low heat. Rushing them gives you browned onions, not truly sweet, jammy ones.
Is caramelization the same as the Maillard reaction?
No. Caramelization breaks down sugar by itself, while the Maillard reaction needs protein and sugar. They often happen side by side in the same pan.
Why did my caramel turn bitter?
It cooked too far past amber, so the sugar began to burn. Pull it earlier next time and stop the cooking quickly.
Sugar
Onion
Butter
