What is the standard method for making a demi-glace and its reduction target?

What is the standard method for making a demi-glace and its reduction target?

• A. Simmer Espagnole with brown stock and reduce until it coats the back of a spoon (nappe); typically reduced by about half.
• B. Simmer Espagnole with white stock and reduce until it becomes clear.
• C. Boil Espagnole with brown stock until thick.
• D. Simmer Espagnole with water and reduce to a glaze.

Answer: (D)

Demi-glace is built by taking Espagnole sauce and enriching it with brown stock, then reducing slowly until it reaches nappe—meaning it coats the back of a spoon with a glossy, velvet texture. The reduction target is typically about in half, which concentrates flavor and thickens the mixture to a rich, pourable glaze rather than a thin sauce. This approach harnesses the gelatin in the brown stock to give body and a deep, roasted depth to the sauce. Using white stock would strip the characteristic color and flavor of demi-glace, while boiling is too aggressive and can break emulsions and overcook flavors. Reducing with water would dilute everything, producing a weak result. Pushing the reduction to a glaze goes beyond the standard demi-glace, yielding a syrupy consistency that’s not the traditional finish for this sauce.

Demi-glace is built by taking Espagnole sauce and enriching it with brown stock, then reducing slowly until it reaches nappe—meaning it coats the back of a spoon with a glossy, velvet texture. The reduction target is typically about in half, which concentrates flavor and thickens the mixture to a rich, pourable glaze rather than a thin sauce. This approach harnesses the gelatin in the brown stock to give body and a deep, roasted depth to the sauce.

Using white stock would strip the characteristic color and flavor of demi-glace, while boiling is too aggressive and can break emulsions and overcook flavors. Reducing with water would dilute everything, producing a weak result. Pushing the reduction to a glaze goes beyond the standard demi-glace, yielding a syrupy consistency that’s not the traditional finish for this sauce.