Syrups, glazes & reductions
Grenadine
Sirop de grenade · A concentrated syrup made from reduced pomegranate juice and sugar, used as a flavouring agent and colorant in cocktails, sauces, glazes and desserts. Commercial versions are often corn-syrup-based and artificially flavoured; the classical foundation is pure pomegranate with cane sugar, producing a vivid crimson syrup with tart-sweet depth and faint tannic grip from the pomegranate skin.
The formula
1 part white sugar : 1 part pomegranate juice (by weight)
Equal parts by weight produces a stable, pourable syrup of approximately 61–65°Bx when fully reduced. Reduce juice gently over low heat until sugar dissolves completely. The syrup should lightly coat a spoon and register 61–65°Bx on a refractometer for shelf stability at room temperature, or 28–32°Bx if storing refrigerated.
Identity
- Made from genuine pomegranate juice — freshly pressed, 100% juice, or diluted pomegranate molasses, never artificial flavouring
- Reduced at bare simmer (85–92 °C) to preserve bright crimson colour and fresh fruit aromatics
- Sugar fully dissolved before or during reduction to prevent crystallisation; syrup is single-phase with no suspended pulp
- Acidified with lemon juice or cream of tartar (pH below 3.5) to stabilise anthocyanin pigments and prevent browning during storage
- Free of commercial thickeners, artificial dyes or high-fructose corn syrup in the classical preparation
Ingredients
| Base | Pomegranate juice (freshly pressed or 100% POM juice) | Press whole pomegranate arils through a fine-mesh strainer or use a slow masticating juicer. Reconstituted concentrate works but lacks aromatic depth. Juice must be free of added sugar or citric acid unless accounted for. |
| Sweetener | White cane sugar | Refined white sugar dissolves completely and contributes clean sweetness without darkening the colour. Measured by weight for precision; volume varies with temperature. Avoid honey or dark sugars which alter colour and flavour. |
| Acid | Lemon juice | Added at 5–10 ml per litre of raw juice (approximately 0.5–1% by volume). Lowers pH below 3.5 to inhibit browning of anthocyanins during reduction. Cream of tartar (1 g/L) is a neutral alternative. |
| Liquid | Water | Optional: a small volume (10–15% of juice volume) may be added to the raw juice to help dissolve sugar evenly, but this extends reduction time and dilutes flavour. |
Method
- 1Strain fresh pomegranate juice through a fine-mesh strainer lined with cheesecloth. Weigh or measure volume. Add lemon juice at 5–10 ml per litre of measured juice.Removes aril membranes and seeds that cause bitterness and cloudiness. Acid is essential from the start to protect anthocyanin pigments during the long reduction.
- 2Combine measured juice and sugar by weight in a wide, heavy-bottomed saucepan (stainless steel or enamelled cast iron). Stir briefly to wet the sugar.Wide pan maximises surface area for evaporation, reducing total cook time and pigment exposure to heat. Heavy base prevents hot spots that cause localised burning.
- 3Place over medium-low heat. Bring slowly to a bare simmer — occasional small bubbles breaking the surface, temperature 85–92 °C. Do not boil.Above 100 °C pomegranate anthocyanins degrade rapidly, turning the syrup from vivid crimson to muddy brown. Bare simmer maintains pigment integrity and controls sugar concentration rate.
- 4Reduce, stirring occasionally, until the juice has reduced and sugar fully dissolved. For shelf-stable syrup at room temperature: continue until refractometer reads 61–65°Bx. For refrigerated use: 28–32°Bx is sufficient. The syrup will lightly coat a cold spoon.61–65°Bx ensures water activity low enough for room-temperature shelf stability (6–12 months). Lower concentration (28–32°Bx) requires refrigeration but is appropriate when the syrup will be diluted in cocktails or used within weeks.
- 5Remove from heat. If any sugar crystals are visible on the spoon or pan sides, add 5 ml water and stir to dissolve. Strain through a fine-mesh strainer.Any undissolved sugar crystals will act as seed crystals and cause the finished syrup to crystallise over time. Straining ensures a perfectly smooth single-phase syrup.
- 6Cool to room temperature in an uncovered or loosely covered container. Transfer to a clean glass bottle. Label with date and concentration (°Bx if measured).Covering while hot traps steam and causes condensation that dilutes the syrup surface. Cooling uncovered minimises this. Glass is inert and preserves colour better than plastic. Dating the batch tracks shelf life accurately.
Techniques that matter
Controlled low-temperature reduction
Pomegranate anthocyanins are heat-labile pigments. Sustained temperatures above 100 °C cause irreversible degradation to brown pigments (phlobaphenes), destroying the defining vivid colour. The bare-simmer method protects colour while still driving off water.
Acidity correction for colour stability
Pomegranate colour is stabilised in acidic conditions (pH < 3.5). Above this range, the red flavylium cation converts to the purple quinoidal base, then to the colourless chalcone. Lemon juice or tartaric acid pushes pH into the stable red zone and extends shelf life.
Refractometer measurement for sugar concentration
Syrup viscosity is not a reliable indicator of concentration — pectin and fruit acids affect feel. Measuring °Bx gives reproducible, scale-independent quality control. Commercial shelf-stable syrups aim for 61–65°Bx; the culinary 28–32°Bx is lower because the syrup is diluted in use.
Variations & derivatives
Grenadine au pomegranate molassesNorth Africa, Middle East
Substitute fresh juice with commercial pomegranate molasses diluted 1:1 with water to approximate raw juice. Reduce total sugar by 30% since molasses contains added sweetener. Result is richer and more astringent with deeper flavour complexity.
Sirop de grenade au mielProvençal, southern France
Replace up to 50% of cane sugar with lavender or acacia honey added off the heat. Contributes floral notes and slight amber tint. Honey-sweetened versions were documented in historic French culinary manuscripts.
Pomegranate-cornelian cherry blendIran, Caucasus
Traditional Persian grenadine substitutes up to 30% of the pomegranate juice with cornelian cherry (Cornus mas) juice, adding deeper ruby colour, higher acidity and more astringent, tannic backbone. Common in sherbet preparations.
Commercial bar grenadineGlobal bars, 20th–21st c.
Made from high-fructose corn syrup, artificial pomegranate flavour, citric acid and Red 40 or similar dye. Syrupy, aggressively sweet, shelf-stable indefinitely. The standard product in professional cocktail work; most commercial cocktail recipes specify this type rather than the culinary foundation.
Used in these dishes
Substitutions
- Fresh pomegranate juice → 100% pomegranate molasses diluted 1:1 with water — Molasses is already reduced and contains its own sugar; dilute to approximate raw juice. Flavour is more concentrated and astringent. Adjust acid balance accordingly.
- Pomegranate juice → Cranberry juice cocktail — Visually similar (bright red) but flavour differs — more acidic, less complex, no tannic character. Acceptable in cocktails where pomegranate nuance is not critical.changes result
- Cane sugar → Light corn syrup — Dissolves more easily and resists crystallisation. Alters flavour (neutral rather than sweet), raises Brix faster. Common in commercial production. Acceptable in cocktail work; less appropriate for culinary applications where flavour matters.changes result
Troubleshooting
Syrup turns muddy brown during reduction
Heat too high; juice boiled rather than simmered; or pH too high (above 4.0) causing anthocyanin degradation to phlobaphenes → Next batch: control temperature more precisely (85–92 °C surface). Current batch: colour is lost but flavour is intact; use for cooking applications where colour matters less.
Syrup crystallises after a few days in storage
Undissolved sugar crystals present (sugar not fully dissolved before reduction, or crystals on pan walls incorporated during cooking); or insufficient acid to keep sucrose in solution → Gently reheat with 5–10% additional water and 1–2% lemon juice. Stir until crystals dissolve. Strain before re-bottling.
Syrup ferments or grows mould after 1–2 weeks
Insufficient reduction — final Brix below 28°Bx leaves water activity high enough for microbial growth; or contaminated equipment → The batch cannot be rescued. Ensure next batch reaches correct concentration. Sterilise bottles by boiling or running through dishwasher. Store refrigerated.
Syrup is too thick or gummy to pour
Reduction continued past target; sugar concentration too high (above 65°Bx for room temperature storage) → Return to heat with 10–15% water, stir and reheat until pourable. Note the original endpoint for future batches.