Brown Butter (Beurre Noisette)
Brown butter, called beurre noisette (hazelnut butter) in French, is butter cooked past melting until its water evaporates and its milk solids toast to golden brown. The result tastes deeply nutty, a little caramel-like, and far more complex than plain melted butter.
What happens in the pan
Butter is about 80% fat, 16% water, and 1–2% milk solids (proteins, lactose, and minerals). Browning it is a three-stage process:
1. Melting. The butter liquefies and starts to bubble.
2. Foaming. The water boils off loudly. While water remains, the butter cannot rise much above 100 °C / 212 °F, which protects the solids from browning. You will see a thick foam on top.
3. Browning. Once the water is gone, the sizzling quiets and the temperature climbs quickly past 120 °C / 250 °F. The milk proteins and lactose sink and undergo the Maillard reaction, producing hundreds of new aroma compounds, including the nutty, toasty notes that give it its name.
The window between perfect golden brown and burnt is short, often 30–60 seconds. Pour it into a heatproof bowl right away; leaving it in a hot pan keeps it cooking.
Colour guide
| Stage | Colour of solids | Flavour | Uses |
|---|---|---|---|
| Light brown | Pale gold | Mild, toasty | Delicate sauces, fish |
| Noisette | Hazelnut brown | Nutty, rich | Cookies, cakes, pasta, vegetables |
| Beurre noir | Deep brown | Intense, slightly bitter | Classic sauce with capers and lemon |
| Burnt | Black | Acrid | Start again |
Brown butter in baking
Browning removes water, so the butter weighs less. 227 g (1 cup) of butter loses roughly 35–45 g. For recipes that rely on butter's moisture, add back about 1 tbsp (15 ml) water or milk per 115 g of butter browned.
Melted brown butter cannot hold air when creamed with sugar. If a recipe calls for creamed butter, chill the brown butter until it firms to a soft, spreadable consistency, about 30–60 minutes in the fridge.
The Maillard compounds give cookies a toffee note and cakes a deeper, almost caramel richness.
Tips
- Use a light-coloured pan so you can see the solids.
- Cut butter into even pieces so it melts evenly.
- Swirl or stir so the solids on the bottom do not scorch in one spot.
- Scrape in the brown bits; they are the flavour.
- Boost it by adding 1–2 tbsp milk powder per 115 g butter. Extra milk solids mean extra browned flavour.
Brown butter vs ghee
Ghee also browns the milk solids, then strains them out for a high smoke point. Brown butter keeps the solids, so it tastes stronger but burns at a lower temperature. It is a finishing and flavouring fat, not a frying fat.
Questions
How long does it take to brown butter?
About 5–8 minutes for 115 g (1/2 cup) over medium heat. It foams as the water boils off, goes quiet, and then the solids turn golden and smell nutty within about a minute, so watch closely at the end.
Can I substitute brown butter for regular butter in baking?
Yes, but brown butter has lost its water, about 15–20% of its weight. Add back roughly 1 tbsp (15 ml) water or milk per 115 g butter, and chill it to soft-solid if the recipe needs creamed butter.
What is the difference between beurre noisette and beurre noir?
Beurre noisette is cooked to hazelnut brown and smells nutty. Beurre noir is cooked further to a deep brown, almost black, and is usually finished with vinegar or lemon and capers; go too far and it tastes bitter and burnt.
Why do you use a light-coloured pan for brown butter?
A stainless steel or light enamel pan lets you see the milk solids change colour. In a dark pan, butter can go from golden to burnt before you notice.