Collins Mix Recipe: The Classic Bourbon Cocktail Base in Minutes

This Collins mix recipe transforms your home bar into a classic cocktail station with just five ingredients and fifteen minutes of work. The secret lies in balancing simple syrup with citrus and aromatic herbs—creating a versatile base that elevates any gin or bourbon Collins to restaurant-quality.

I developed this mix after years of perfecting the perfect batch, ensuring it stays fresh for weeks in the fridge.

The foundation is a 1:1 simple syrup (equal parts sugar and water) that dissolves completely for smooth mixing, while lemon juice and rosemary add bright, herbal complexity without overpowering. This ratio works perfectly for traditional gin Collins but adapts easily to modern twists like cucumber or mint variations.

The key is precision—using fine sugar prevents graininess, and steeping rosemary briefly infuses aroma without bitterness.

What you’ll end up with is a golden, aromatic syrup that transforms any Collins into a sophisticated drink with professional depth.

The mix keeps for up to four weeks, making it ideal for batch prep—whether you’re stocking your bar for summer entertaining or simply want to impress guests with homemade cocktails. Each sip delivers that signature balance of sweetness, acidity, and herbal notes that define a classic Collins.

Use it as-is for traditional gin Collins or experiment with bourbon, rum, or even sparkling wine for modern variations. The instructions below break down the exact measurements and steeping time to guarantee consistent results every batch. Let’s get mixing!

Ingredients for collins mix

Five ingredients blend into a golden syrup that transforms any Collins into a bourbon bar classic.

The sugar is non-negotiable—Domino or C&H brands dissolve perfectly without graininess. For rosemary, Whole Foods or local farmers markets carry the freshest sprigs with vibrant green needles. The bourbon adds depth, so Buffalo Trace or Maker’s Mark are my go-tos, but any 80-proof whiskey works. If you’re using dried rosemary, reduce to one-quarter ounce and steep twice as long. The lemon juice should be freshly squeezed—bottled juice lacks the bright acidity this mix needs. For water, reverse osmosis filtered gives the cleanest base, but tap water works in a pinch if it’s not heavily chlorinated.

No bourbon? Substitute equal parts vodka or gin, though bourbon’s caramel notes are signature. Short on rosemary? Thyme or lavender buds add different herbal complexity—just adjust steeping time to 10 minutes. The sugar-to-water ratio is critical: granulated must dissolve completely to avoid cloudiness. If you’re making a larger batch, double the water first, then add sugar to ensure full saturation. For a non-alcoholic version, omit the bourbon entirely—it won’t affect the syrup’s balance, just the cocktail’s finish.

This mix stays fresh for 4 weeks refrigerated in an airtight glass jar. The rosemary will lose potency after 2 weeks, so use it within that time for best flavor. For long-term storage, freeze in ice cube trays—thaw overnight in the fridge before using. The syrup thickens slightly when chilled, so stir gently before measuring. I always make a double batch—one for immediate use and one to freeze for future Collins nights. The bourbon aroma intensifies after a few days, so wait 24 hours before using for maximum depth.

Step-by-step instructions for crafting Collins mix

This classic bourbon cocktail base delivers balanced sweetness, herbal complexity, and citrus brightness every time.

In a medium saucepan, combine the 2 cups granulated white sugar and 2 cups distilled water. Bring to a gentle boil over medium-high heat, stirring occasionally to prevent scorching. The sugar will dissolve completely, creating a smooth, colorless syrup.

Once boiling, reduce heat to medium-low and let it simmer for 5-7 minutes until the mixture reaches 160°F on a candy thermometer. You’ll notice the syrup becomes slightly thicker and clearer—this is your signal it’s ready. Remove from heat immediately to prevent crystallization.

Here’s the thing—using fine granulated sugar ensures a silky texture without graininess. If you see any sugar crystals clinging to the pan sides, stir vigorously to dissolve them completely before proceeding. This step forms the sweet foundation of your Collins mix.

While the syrup cools slightly (to about 120°F), add the 0.5 oz fresh rosemary sprigs and 0.25 cup bourbon whiskey. The rosemary should be whole sprigs—this allows for proper infusion without overpowering the mix. Stir gently to combine, then cover the pan loosely with a lid.

Let the mixture steep for 15-20 minutes at room temperature. You’ll notice the rosemary releases its piney aroma and the whiskey mellows the overall profile. The color will develop a subtle golden hue from the rosemary’s natural oils. This infusion creates the herbal backbone that makes Collins mix distinctive.

Don’t skip this step—it’s what transforms a simple syrup into something complex. If you’re impatient, you can speed it up slightly by placing the covered pan in an ice bath while stirring occasionally, but let it cool naturally for best flavor extraction.

After steeping, strain the mixture through a fine-mesh sieve lined with cheesecloth into a clean glass container. Press gently on the rosemary sprigs to extract all the infused oils. Discard the sprigs—they’ve done their job. You should have about 2 cups of infused syrup at this point.

While still warm, stir in the 1 cup fresh lemon juice gradually. The acidity will brighten the flavors and balance the sweetness. You’ll notice the mixture become slightly cloudy—this is normal and indicates proper infusion. Taste a small amount at this stage to gauge the balance between sweet, herbal, and citrus notes.

Here’s where precision matters: if the mix tastes too sweet, you can add a splash more lemon juice (up to 1 tablespoon); if it’s too tart, add a small amount of the infused syrup. The goal is a harmonious blend where no single element dominates. This classic ratio delivers that perfect equilibrium.

Let the Collins mix cool completely to room temperature, then transfer it to a clean glass bottle or jar with an airtight seal. The mix will keep in the refrigerator for up to 3 months, maintaining its vibrant flavors. For best results, use within 2 months for peak freshness.

This mix serves as the foundation for classic bourbon Collins cocktails. The proper cooling process allows all the flavors to meld together without any heat-induced bitterness. When ready to use, shake 2 ounces of the mix with 1.5 ounces bourbon, 4 ounces club soda, and ice for the perfect Collins.

Real talk: the first batch might be your favorite because you’ve just created something truly classic. The rosemary infusion gives it that sophisticated herbal note that separates homemade mix from store-bought. Store it properly, and you’ll have a ready-to-use cocktail base whenever you crave a refreshing bourbon drink.

Essential equipment for this recipe

Precision Tools

Your first essential is a candy thermometer—I use the Thermoworks Thin Needle—to monitor the syrup’s temperature precisely at 160°F. This ensures perfect sugar dissolution without scorching. A fine-mesh sieve with cheesecloth is critical for straining rosemary oils without clogging.

I also recommend a glass measuring cup for accurate liquid measurements, especially when combining the 2 cups water and 2 cups sugar. 🌡️

Infusion Equipment

For the rosemary infusion, a stainless steel saucepan (I use All-Clad) is ideal—it heats evenly and won’t impart flavors. A loose-fitting lid helps trap aroma while allowing steam to escape.

If you’re short on time, a fine-mesh infuser (like Bar Tools) lets you steep rosemary directly in the mix without straining. For bourbon lovers, a glass decanter with a lid preserves the whiskey’s caramel notes during infusion. 🥃

Storage Solutions

Transfer your finished mix to a glass bottle with airtight seal—I prefer Le Parfait 375ml bottles for their durability. A glass jar with a silicone lid (like Ball Mason) works too, but avoid plastic—it can absorb flavors over time.

For portion control, 1-ounce cocktail syringes make measuring easier when crafting drinks. Label your container with the date to track freshness. ❄️

Budget-Friendly Swaps

No candy thermometer? Use the string test: Dip a string in cold water, then into the syrup—when it forms a hard ball that cracks when dropped, it’s at 240°F (overshooting slightly is fine). A clean kitchen towel can replace cheesecloth for straining.

For storage, a clean soda bottle with a cork works in a pinch, though glass is ideal. Even a spoon and bowl suffice for mixing if you’re prepping small batches. 💡

Pro Upgrades

For serious mixologists, a digital scale (like OXO Good Grips) ensures precise sugar measurements. A stainless steel immersion circulator (such as PolyScience) lets you control syrup temperature to ±0.1°F for consistency.

For large batches, a food mill (like OXO) speeds up straining. I also keep a small funnel** handy to avoid spills when transferring syrup to bottles. 🔥

Frequently asked questions