Blackcurrant Syrup Recipe

This blackcurrant syrup recipe is intensely flavored, and unlike anything else. Made with fresh or frozen black currants and only takes 10 minutes and produces a syrup that is amazing in cocktails, sparkling drinks, coffee and pancakes.

Blackcurrants sit in their own category when it comes to berry syrups. They’re deeper and earthier than my raspberry syrup, more complex than blackberry simple syrup, with a concentrated berry depth that sits close to wine

Save

How I developed this recipe

I came to blackcurrant syrup after making the red currant version and wanting something with more body and less sharpness – blackcurrants deliver exactly that, though the first batch taught me they need slightly less sugar than red currants despite being similarly tart, because their natural depth carries the flavor in a way red currants don’t.

Blackcurrant syrup recipe ratio

I used 1 cup white sugar to 1 cup water. Blackcurrants are tart but they have a richness and depth that makes a 1:1 ratio work. At this ratio the syrup is concentrated enough to work in a cocktail with a tablespoon, versatile enough to use in sparkling drinks without over-sweetening, and has enough body to work as a cordial base when diluted. If you want to understand how ratio choices affect finished texture and sweetness, my simple syrup ratio guide covers it in full.

For a cassis-style syrup which is thicker, more concentrated, closer to a crème de cassis substitute, use a 1 and half cups sugar to 1 cup water. It pours slowly, is genuinely viscous at room temperature. At that ratio it’s too sweet to use as a straight drink syrup, but as a cocktail modifier used in small amounts it’s one of the better things to have in the fridge.

Ingredients

• Frozen blackcurrants – more practical than fresh given how seasonal the fruit is, and the flavor is just as good. Frozen blackcurrants release juice immediately on heating and don’t need thawing first. The deep, almost inky color they produce in the pan is one of the more striking things to watch in a syrup recipe.

• White sugar – blackcurrants have enough natural depth and complexity that adding a brown sugar note would compete rather than complement. White sugar lets the fruit speak entirely for itself, which is exactly what you want here.

• Water – filtered if your tap is heavily chlorinated.

• Lemon juice – 1 tsp added off the heat. Blackcurrants are complex enough that the lemon is more about balance than brightening. It stops the syrup tasting heavy and keeps the fruit flavor clean at the finish.

How to make blackcurrant syrup

Add the frozen blackcurrants, sugar, and water to a small saucepan over medium heat. Blackcurrants are denser and less fragile than red currants – they take a little longer to collapse but release a startling amount of dark, almost purple-black juice once they do. Stir gently and give them three to four minutes before expecting much to happen. The color shift when they finally break down is dramatic – the liquid goes from pale to a deep, near-opaque purple-black almost instantly.

Bring to a gentle simmer and cook for five to six minutes until the currants are fully collapsed and the syrup is deeply colored and glossy. The same rule applies here as with red currant syrup – don’t push the heat. A rolling boil cooks off the volatile aromatic compounds that give blackcurrant its distinctive earthy, almost musky depth, and you end up with something that tastes like cooked fruit rather than the real thing. I’ve made this mistake once and it’s easy to avoid.

Remove from heat and strain through a fine mesh sieve pressing the solids firmly – blackcurrant skins hold a significant amount of the deep color and flavor, so press thoroughly. The finished syrup in the jar will be so dark it’s almost opaque when cold and clears slightly when warmed. Leave uncovered until fully cool before sealing and refrigerating.

Save

Tips from testing

• Don’t rush the heat. Blackcurrant’s earthy, complex depth is the first thing lost at high temperature. Gentle simmer from start to finish.

• The color is extraordinary and worth protecting. Hard boiling dulls it from deep purple-black toward a muddy brown. Keep the heat low.

• Press the skins firmly when straining. Blackcurrant skins hold more color and flavor per gram than almost any other fruit I work with. A passive drain wastes a significant amount of both.

• The syrup is stronger than it looks. One tablespoon in a cocktail is usually enough – taste before adding more. The depth of flavor means a little goes a long way compared to a berry syrup.

Blackcurrant syrup taste and flavor notes

• Sweetness: medium, rich, and deep
• Primary note: dark, earthy blackcurrant
• Secondary note: a wine-like depth and a faint floral edge that stays in the background.
• Overall profile: the most intense and complex syrup in the collection. More of a modifier than a straightforward sweetener. It changes the character of a drink rather than just adding sweetness.

Blackcurrant syrup uses

• Kir and Kir Royale – the classic application and the one this syrup was made for. Use the thicker version, add a splash to a glass of dry white wine for a Kir, or to prosecco or champagne for a Kir Royale. The deep purple color bleeding into the pale wine is one of the more visually striking drinks you can make with two ingredients.

• Cocktails – works beautifully in a blackcurrant gin and tonic, a blackcurrant vodka soda, or as the sweetener in a whiskey sour where you want something darker and earthier than a standard simple syrup. The depth of flavor makes it especially good with aged spirits and dry vermouths.

• Sparkling water and cordial – a tablespoon in sparkling water over ice is the simplest non-alcoholic use and one of the better ones. For a proper cordial, dilute 1 part syrup to 4 parts still or sparkling water.

• Desserts – the thicker ratio over vanilla ice cream, panna cotta, or a plain cheesecake is genuinely excellent. The intensity of the blackcurrant cuts through dairy richness in a way softer berry syrups don’t. Also good stirred into plain yogurt or drizzled over crepes.

• As a cassis substitute – use the thicker version anywhere a recipe calls for crème de cassis. The alcohol is missing but the flavor profile is close enough for most non-alcoholic applications.

Save

Storage and shelf life

Blackcurrant syrup keeps in a sealed glass jar in the refrigerator for up to 2 weeks. The flavor is most intense and complex in the first four days – the earthy, almost musky depth is strongest right after making and gradually mellows into something rounder and more jammy toward the end of the first week. I prefer the early version in cocktails where the intensity is an asset; the mellower version works better in cordials where you want fruit flavor without the edge.

Freeze in an ice cube tray for up to 3 months; one cube is roughly one tablespoon. Before using, check the color, fresh blackcurrant syrup is a deep, clear purple-black. A murky or brownish shift in color, a surface film, or a fermented smell on opening are your signs to discard and start fresh.

Variations

• Blackcurrant and raspberry syrup – replace half the blackcurrants with frozen raspberries. The raspberry adds brightness and a floral note that lifts the earthiness of the blackcurrant – better suited to lighter cocktails and sparkling drinks than the straight blackcurrant version.

• Spiced blackcurrant syrup – add a cinnamon stick and a star anise pod while simmering, remove before straining. Dramatically deeper and more complex and excellent in mulled wine, winter cocktails, and a hot toddy variation.

• Blackcurrant vanilla syrup – add 1/2 tsp vanilla extract off the heat. Rounds out the earthy depth and makes it more approachable in dessert applications.

Other berry syrup recipes you can try

• Strawberry syrup
• Raspberry syrup
• Red currant syrup