Syrups, glazes & reductions
Pekmez (grape-must reduction)
Pekmez · Pekmez is a thick, dark, sugar-rich syrup made by slowly simmering fresh grape must (unfermented pressed grape juice) until it reduces to roughly one-third of its original volume. A pinch of wood ash or a small amount of clay is traditionally added during cooking to neutralize natural acids, prevent caramelization of the sugars from turning bitter, and clarify the syrup. The result is a dense, pourable concentrate with a deep brown color, used across the Mediterranean, Anatolia, the Levant, and the Balkans as a sweetener, glaze, and flavoring base.
The formula
fresh grape must reduced to ~1/3 of original volume
Per the prior pass and source [2]: must is simmered until it loses roughly two-thirds of its starting volume, reaching a syrupy consistency.
Identity
- Made only from unfermented grape must (juice pressed before wild yeasts convert sugar to alcohol)
- Cooked/boiled rather than fermented, so it is sweet, not alcoholic
- Clarified with wood ash, marl clay, or similar alkaline agent — not just a plain reduction
- Reduced to roughly one-third of starting volume for a dense, pourable syrup
- Color ranges from amber-brown to very dark brown depending on grape variety and reduction time
- Functions as a pantry-stable natural sweetener with a long shelf life
Ingredients
| Base | fresh ripe grape must (pressed, unfermented grape juice) | Any wine grape works; dark varieties (e.g., Concord, Mavro) give deeper color and flavor. |
| Liquid | water | Small amount added during initial boil of grapes to soften pulp and aid juice extraction; not used if juice is already pressed. |
| Seasoning | food-grade wood ash or fine marl clay | Traditional clarifier: raises pH, neutralizes excess acidity, and traps impurities so the syrup reduces cleanly without scorching. |
Method
- 1Press ripe grapes and strain the juice (must) within 20–30 hours to avoid wild fermentation.Sources [2] and [4] note fermentation begins 20–30 hours after pressing; cooking must start before this to preserve sweetness and prevent alcohol formation.
- 2Bring the must to a boil in a wide, heavy-bottomed pot, skimming foam and rising impurities.Wide surface area accelerates evaporation; skimming removes seeds, skins, and pectin for a clearer syrup.
- 3Add a small amount of food-grade wood ash or clay and stir to disperse.Source [1] confirms wood ash/clay acts as a clarifier, neutralizing acidity and binding suspended particles so sugars reduce cleanly.
- 4Lower to a steady simmer and reduce, stirring occasionally, until volume drops to roughly one-third.Slow simmer concentrates sugars without scorching; the one-third endpoint yields a thick, pourable syrup per source [2].
- 5Skim any remaining foam and strain through cheesecloth if a clearer syrup is desired.Final straining removes last particulates; some traditions (e.g., Greek petimezi) leave it rustic while others (Italian mosto cotto) clarify further.
- 6Pour hot pekmez into sterilized glass jars and seal; cool completely before storing.Sterile jars plus high sugar content give the syrup its multi-year shelf stability described in source [4].
Techniques that matter
Rapid pressing and straining
Must be processed before wild yeasts ferment the sugars; per source [4], fermentation starts 20–30 hours after extraction.
Alkaline clarification with ash or clay
Neutralizes grape tartaric acid and binds impurities, preventing the syrup from becoming harsh or cloudy during long reduction.
Slow open-pot reduction
Gentle simmering concentrates flavor and color without burning the sugars; deep color and complex flavor develop over hours.
Variations & derivatives
PekmezTurkey / Anatolia
Most common form; often made with the addition of a little limestone or ash; pairs with tahini as a classic breakfast.
PetimeziGreece
Reduced to a thicker stage than light grape syrup; used in Moustokouloura cookies and as a traditional cough remedy.
Mosto CottoItaly (especially Veneto)
Cooked must used both as a sweetener and as the base for the dessert wine Vino Cotto / Vinsanto.
Dibis / DibsLevant and Arab world
Often slightly less reduced and sometimes flavored; commonly drizzled over cheese, bread, or semolina desserts.
HardaliyeThrace / Balkans
Grape must thickened with flour and fermented slightly with mustard seed or grape leaves; sits at the boundary between syrup and condiment.
Used in these dishes
Substitutions
- wood ash clarifier → food-grade calcium carbonate (chalk) or a tiny pinch of baking soda — Modern kitchen substitute that performs the same acid-neutralization and clarifying role; use sparingly.
- fresh pressed grape must → unsweetened 100% grape juice (no preservatives) — Works in a pinch; expect a slightly thinner result since commercial juice is already filtered and may lack pulp solids.
- fresh pressed grape must → date or carob syrup — Closest non-grape analogue in flavor profile and viscosity, but distinctly different in taste.changes result
Troubleshooting
Syrup tastes sharp or acidic
Insufficient ash or clay was used, or grapes were very high in tartaric acid → Stir in a little more wood ash or a small pinch of baking soda while still warm, then re-strain.
Syrup scorches or tastes burnt on the bottom
Heat too high, or pot too narrow with too little surface area → Reduce heat to a bare simmer, switch to a wider heavy-bottomed pot, and stir more frequently.
Syrup ferments or bubbles in the jar
Must began fermenting before boiling, or jars were not sterilized → Discard and restart with faster pressing and sterilization; fermentation means it is no longer pekmez but a low-alcohol vinegar.
Syrup is too thin
Reduction stopped before reaching the one-third volume mark → Return to a low simmer and reduce further; test by chilling a spoonful on a cold plate for proper set.