The Cobra’s Fang is a tiki classic built on three rums, fresh citrus, and a handful of specialty syrups — all shaken together in about five minutes. It’s strong, it’s citrusy, and it’s genuinely impressive to put in front of guests. If you’re making a round for a group, the batching math is straightforward and the whole thing comes together fast.
Before you start
The two things that actually affect the outcome here are your ice and your citrus. Crushed ice isn’t just for looks — it dilutes the drink at the right rate and keeps the 151-proof rum from hitting too hard upfront, so use it in the glass rather than cubed ice. Fresh-squeezed lime and orange juice matter more in this drink than in most cocktails because there’s no mixer to hide behind; bottled juice goes flat against the rum and makes the whole thing taste dull. Squeeze both right before you shake. If you’re making a batch for several people, juice everything ahead and keep it cold, but don’t mix the full batch more than an hour before serving or the citrus starts to lose its brightness.
Troubleshooting
- Drink tastes boozy and harsh: The 151-proof rum is almost certainly not integrated enough. Shake longer and harder — at least 15 full seconds. The shaker should be uncomfortably cold to hold before you stop.
- Too sweet, syrupy finish: Check your falernum and passion fruit syrup quantities. Both are easy to over-pour. Measure with a jigger, not a free pour, especially when scaling up.
- Flat, thin flavor: The Angostura bitters are doing more work than they look like they are. A single dash is easy to skip by accident — don’t. It ties the rums to the fruit.
- Batch tastes uneven glass to glass: When multiplying the recipe, stir the batched mixture well before each pour — the denser syrups settle to the bottom quickly.
- Garnish mint wilts immediately: Mint bruises fast once it’s cut. Slap the sprig firmly against your palm right before placing it — this releases the aroma without browning the leaves. Skip the lime wheel if you’re making a round of drinks; it adds prep time and nobody notices it once the mint is there.
Make-ahead notes
You can pre-batch the full liquid mixture — all the rums, syrups, juices, bitters, and grenadine — up to 24 hours ahead. Store it in a sealed jar or pitcher in the fridge. Give it a good stir before using because the syrups will settle. Do not add ice to the batch in advance; shake each serving individually over ice, or if you’re pouring for a crowd all at once, stir the cold batch vigorously and pour straight over crushed ice in each glass. The citrus juice holds well for about 24 hours refrigerated before it starts tasting flat, so don’t push it past that window. There’s no freezer step here — the alcohol content prevents proper freezing and the texture suffers.
Cobra's Fang
Ingredients
Main Ingredients
- 1 oz Fresh-squeezed lime juice
- 1 oz Fresh-squeezed orange juice Preferably Valencia oranges
- ½ oz Passion fruit syrup
- ½ oz Falernum A spiced citrusy syrup
- 1 oz Light rum Preferably Cuban
- 1 oz Dark rum Preferably Jamaican
- ½ oz 151-proof rum A strong overproof rum
- 1 dash Angostura bitters
- 1 dash Grenadine For color and sweetness
Garnish
- 1 sprig Mint
- 1 slice Lime wheel For a tropical touch
Instructions
- Fill a cocktail shaker with ice cubes. Measure and pour in lime juice, orange juice, passion fruit syrup, falernum, light rum, dark rum, 151-proof rum, Angostura bitters, and a dash of grenadine. Shake vigorously until the exterior of the shaker becomes icy cold.
- Strain the mixture into a chilled highball or tiki glass filled with fresh crushed ice for a truly refreshing experience.
- Garnish with a sprig of mint and a lime wheel. Present with a straw to enjoy the aromatic essence of the mint as you sip.
Notes
Nutrition
Your questions, answered
What can I use instead of falernum if I can’t find it?
A mix of simple syrup with a small pinch of ground clove and a few drops of almond extract gets you close enough for a home batch. Falernum is available online and at most liquor stores with a decent cocktail section, but the substitute works fine if you’re making this once and don’t want to track down a specialty bottle.
Can I leave out the 151-proof rum?
Yes — the recipe card notes this too, but to be specific: replace it with an extra half ounce of your dark rum and the drink stays balanced. The 151 adds heat and proof more than flavor, so the cocktail is still very good without it, just noticeably less potent.
How do I scale this up for a party of eight or ten people?
Multiply every ingredient by the number of servings and combine in a large pitcher or jar — it scales cleanly. The one thing to watch is the bitters: measure carefully rather than eyeballing dashes, because bitters can overwhelm a large batch fast; use roughly one teaspoon per eight servings as a reliable conversion.
Where do I find passion fruit syrup?
Most grocery stores carry it in the cocktail mixer aisle or the international foods section — Monin and Torani both make widely available versions. You can also order it online, or make a quick version by stirring equal parts sugar and passion fruit juice concentrate over low heat until the sugar dissolves.
