Demi-glace

Roast bones back onto roast meat: a concentrate of the same animal, returned.

Acid and tannin thin the gloss and stop it reading as pure warm gelatin.

Sweated, deglazed, reduced. The only aromatic the sauce genuinely needs.

Perigueux: gelatin carries truffle volatiles further than fat manages to.

Reduced veal stock plus baked wine: two long Maillard projects finishing together.

Poached discs on steak, under a sauce made from those very same bones.

Mounted cold at the end, it splits the gloss into something pourable.

Guanylate over inosinate. It does not taste of mushroom, only of more.

Fermented sweetness in a savoury reduction reads as another hour of roasting.

A square dissolved in: cocoa butter thickens, bitterness lengthens the finish.

A spoonful in a reduction darkens it. Read as depth, never as coffee.

Shared pyrazines from two long roasts. A spoonful of espresso, no more.

Cassis has the sulfur and tannin to sit inside a meat reduction, not beside it.