Half Glaze

Ingredients

Equipment Needed

• •8-quart wide, heavy saucepan or rondeau
• •Fine-mesh chinois (conical strainer)
• •Small skimmer or shallow ladle
• •Clean wooden skewer for marking the reduction
• •2-quart lidded heatproof vessel for the bain-marie
• •Shallow storage containers and an ice bath

Instructions

1. 1

   Mark the finish

   Pour exactly 1.8 quarts (7.2 cups / 1.70 L) water into the empty reduction pot. Stand a clean wooden skewer upright against the center of the pot floor and score it at the waterline, then empty and dry the pot. This mark is your true measure: after the Espagnole and stock reduce to that level, the sherry will restore the sauce to its final two-quart yield.

   Use the same pot and hold the skewer in the same place at every check. A clock can suggest when the sauce is ready, but only the volume can tell you.
2. 2

   Join the foundations

   Combine the Sauce Espagnole and first-class brown stock in the wide pot. Warm them over medium heat, stirring gently until any chilled gel has melted and the mixture is completely even, then bring it only to a bare simmer. Leave the pot uncovered. Do not season now, because reduction concentrates every grain of salt already present in the two foundations.

3. 3

   Reduce and dépouiller

   Hold the sauce at the quietest steady simmer for 2 to 3 hours, stirring across the pot floor every 15 minutes and skimming away the foam and fat that gather on top. This is dépouillement, the slow skimming that leaves a brown sauce clear-tasting and polished. If the sauce boils hard and turns cloudy or greasy, lower the heat, leave it undisturbed for five minutes, then skim what rises. Ça se rattrape. If you smell scorching, stop stirring at once and ladle the unburned sauce into a clean pot without scraping the floor; bitterness that has spread through the whole sauce cannot honestly be hidden.

4. 4

   Measure and strain

   Begin checking with the marked skewer as the sauce approaches half its starting volume. When it reaches the mark, pass it through a fine-mesh chinois into a clean heatproof vessel without pressing on anything caught in the strainer. Confirm that you have 1.8 quarts (7.2 cups / 1.70 L). If there is more, return it to the rinsed pot and reduce gently; if it slipped below the measure, restore it with only enough boiling water to reach the target. You are replacing lost water, not diluting the intended sauce.

5. 5

   Finish off fire

   Take the strained reduction completely off the heat and stir in the sherry. Do not boil it afterward; the off-fire finish preserves the sherry's lifted, nutty aroma against the deep roasted foundation. The demi-glace should be nappant (coating), flowing from a spoon in a glossy ribbon and leaving a fine film across its back. Taste before reaching for salt, because the foundations have already concentrated.

6. 6

   Hold or cool

   For service within an hour, cover the sauce and keep it in a bain-marie, with the container set over gently heated water that reaches halfway up its sides. If a lid is impractical, smooth the optional butter lightly across the surface. Should a skin form, lift it away instead of beating it back into the sauce. For make-ahead storage, divide the demi-glace among shallow containers, cool them promptly in an ice bath, then cover and refrigerate within two hours. The sauce will set firmly in the cold and melt back to its gloss over gentle heat. One cook, one stove, one evening, and the whole brown sauce family is waiting.

Chef Tips

• •The two finished foundations decide the sauce. Use a properly cooked Espagnole and a gelatin-rich brown stock that sets softly in the cold; thin packaged broth can reduce for hours and still give you salt without body.
• •Choose a sherry you would willingly pour into a glass, preferably a dry amontillado or oloroso. Salted cooking sherry becomes harsh under this much concentration and has no place here.
• •A broad pot shortens the reduction by exposing more surface, but it also demands attention near the end. Once the sauce approaches the skewer mark, stir and measure frequently; the final inches disappear much faster than the first.
• •Freeze the finished sauce in 1/2-cup (120 ml / about 125 g) portions. That is enough to begin a smaller brown sauce or strengthen the sauce around a roast without thawing the whole batch.

Advance Preparation

• •Both the Sauce Espagnole and first-class brown stock may be completed and chilled before reduction. This recipe begins with those finished components, exactly as the classical sauce system intends.
• •The reduction can be strained and chilled one day ahead before the sherry is added. Reheat it gently to a bare simmer, remove it from the fire, then stir in the sherry just before holding or serving.
• •Finished demi-glace keeps for up to 4 days under refrigeration or 3 months frozen in small portions. Reheat only what you need over gentle heat, loosening it with a spoonful of water if cold storage has tightened it too far.

Frequently Asked Questions

Nutrition Information

1 serving (about 240g)