How I Make Beurre Noisette for Financiers

Beurre noisette gives a classic financier its toasted hazelnut aroma. I make it by browning the milk solids in butter, then weigh the finished butter the recipe actually needs rather than assuming the starting and finishing weights are equal.

Butter first melts, then its water boils away. The foam changes as moisture leaves, and the milk solids settle and begin to toast. Clarified butter removes water and milk solids; beurre noisette deliberately keeps and browns those solids.

The aroma should move from dairy to nutty and toasted. Black solids and acrid smoke mean I have gone beyond useful browning.

I use a light-coloured saucepan so I can see the solids. I melt the butter over controlled heat, stir or swirl for even cooking and watch the solids beneath the foam.

When the solids are evenly amber and the aroma is distinctly nutty, I immediately transfer everything to a cool heatproof container. Leaving it in the hot pan continues the browning.

The toasted milk solids carry much of the characteristic flavour. I scrape them into the container and later distribute them through the batter.

If the solids are black rather than brown, straining them out does not restore the clean flavour of properly browned butter.

Water loss means 95 g ordinary butter before browning does not produce 95 g beurre noisette. I prepare more than the required quantity, brown it, then weigh 95 g of the finished warm product for a formula calling for 95 g finished browned butter.

If I need a repeatable production yield, I record the starting butter, finished weight and cooking loss for the butter I actually use.

I add the finished butter fluid and warm, not scorching hot. Excess heat can disturb the egg-white batter; butter that has cooled too far becomes difficult to disperse smoothly.

I add it gradually while mixing until no separate fat remains around the bowl.