If you love caramel, this rum caramel sauce is a beautiful way to make it even richer. It is thick, creamy, buttery, and finished with smooth rum for a warm, grown-up flavour that is perfect for drizzling over desserts.
Rum and caramel sauce are a natural match. Rum is made from sugar cane, so it already has deep, sweet notes that sit beautifully alongside dark caramel. When the two are combined, the result is a rich rum caramel sauce with a deep amber colour, a silky texture, and a smooth flavour that feels a little special without being complicated.
This homemade caramel sauce is ideal when you want something more exciting than plain caramel. It has the familiar buttery sweetness you expect, but the rum adds warmth, depth, and a gentle kick. It is not overpowering, and the salt is balanced so the sauce stays sweet and smooth rather than sharply salty.
Use this sauce anywhere you would normally use caramel sauce: over ice cream, cakes, brownies, muffins, cheesecakes, mousse, or as a homemade edible gift. If you are comfortable making caramel, this recipe is straightforward. If you are new to it, the step-by-step tips below will help you understand what to look for as the sugar cooks.
What you’ll love about this recipe
- Deep caramel flavour: The sugar is cooked until it reaches a deep amber colour, giving the sauce a full caramel taste rather than a pale, mild sweetness.
- Smooth rum flavour: Dark or gold rum adds warmth and a slightly spicy note that works perfectly with caramel.
- Perfect for desserts: Drizzle it over your favourite grown-up desserts wherever you would normally use caramel sauce.
- Balanced saltiness: The salt helps cut through the sweetness without making the sauce taste overly salty.
- Great for gifting: Pour it into a clean jar, add a label or ribbon, and it becomes a thoughtful homemade gift.
Scroll to the recipe card for the full ingredients list and printable-style instructions, or keep reading for ingredient notes, process tips, and serving ideas.
Ingredients
You only need a short list of simple ingredients to make this rum caramel sauce, and one of them is water. The key is to measure everything before you start, because caramel moves quickly once it begins to colour.
Sugar: Caster sugar or superfine sugar dissolves quickly, making it a good choice for caramel. Regular granulated sugar can also be used if that is what you have.
Corn syrup or liquid glucose: This is optional, but it is helpful, especially if you are new to caramel making. It reduces the chance of the sugar recrystallising and turning the sauce grainy.
Cream: The cream used here may be called standard cream, whipping cream, single cream, full cream, or heavy cream depending on where you live. Heavy cream will make the sauce slightly thicker.
Unsalted butter: Unsalted butter makes it easier to control the final salt level. If you only have salted butter, add less sea salt at first, taste the cooled sauce carefully, and adjust as needed.
Flaky sea salt: Fine flaky sea salt dissolves well. If your salt is coarse, grind it a little before adding it. Table salt is much finer, so use less if substituting.
Rum: Dark rum or gold rum both work well. White rum is not ideal because the flavour is usually less smooth in caramel. Whiskey can be used instead if you prefer a different flavour.
Optional vanilla: If you like, add a teaspoon of vanilla extract, vanilla paste, or the seeds from a vanilla bean for extra aroma.
Important tip: Before you begin, measure every ingredient and have your saucepan, spoon or spatula, pastry brush, thermometer if using, and heatproof jar ready. Caramel is all about timing, and being prepared makes the process much easier and safer.
How to Make Rum Caramel Sauce
Caramel can feel intimidating the first time you make it, but the process is simple when you follow the steps carefully. This recipe uses the wet caramel method, which means water is added to the sugar to help it dissolve before it caramelises. This method is helpful for beginners because the sugar heats more evenly.
Start by warming the cream slightly. Heat it in the microwave for about 30 to 40 seconds, or until it is warm but not boiling. Warm cream is easier to combine with hot caramel and usually splutters less than cold cream.
Add the sugar, water, and corn syrup or liquid glucose to a medium heavy-based saucepan. Choose a pan with more room than you think you need, because the caramel will bubble up when the cream is added.
Stir gently just to combine the ingredients and moisten the sugar. Place the pan over medium-high heat. Stir occasionally while the mixture heats and the sugar begins to dissolve. Once the syrup comes to a boil, stop stirring.
Use a pastry brush dipped in water to brush down the sides of the pan. This removes visible sugar crystals, which can cause the finished caramel sauce to become grainy.
If you have a candy thermometer, clip it to the pan. If not, you can still make the sauce by watching the colour and bubbles closely.
The syrup will boil with thin bubbles at first. As the water cooks off and the sugar begins to caramelise, the bubbles will look thicker and pop more slowly. The aroma will also become more noticeable.
Do not stir while the caramel cooks. If needed, gently swirl the pan once or twice so the caramel colours evenly. Cook until it reaches a deep amber shade, about 170°C or 340°F on a thermometer.
Keep your full attention on the pan at this stage. Caramel can move from golden to burnt very quickly, so remove it from the heat as soon as it reaches the right colour.
Remove the pan from the heat and carefully pour in the warm cream while stirring with a long-handled spoon or heatproof spatula. The caramel will bubble and splutter, so pour slowly and keep your hands clear of the steam.
Return the pan to medium-high heat and boil the sauce for another 1 to 2 minutes, or until it reaches 115°C or 240°F. This helps the sauce thicken.
Turn off the heat, then add the butter and salt. Start with part of the salt, let a spoonful of sauce cool slightly, then taste and add more if needed. The sauce will be very hot, so never taste it straight from the pan.
Finally, stir in the rum. You can add half first and taste before adding the rest, or add the full amount for a stronger rum caramel flavour.
Let the sauce cool slightly before pouring it into a heatproof jar or container. It will continue to thicken as it cools.
Storing and Reheating
Store the rum caramel sauce in an airtight container or lidded jar in the refrigerator. It will keep for several weeks. Reheat it gently before serving, either in short bursts in the microwave or in a small saucepan over low heat. Stir until smooth and pourable.
Ways to Use Rum Caramel Sauce
- Drizzle it over vanilla ice cream, rum and raisin ice cream, or any simple scoop that needs a rich caramel topping.
- Spoon it over apple cake, apple muffins, pancakes, waffles, or warm puddings.
- Use it with chocolate desserts such as brownies, chocolate mousse, or chocolate caramel cheesecake.
- Stir a little into caramel buttercream for extra flavour.
- Pour it into a clean jar, add a ribbon or twine, and give it as a homemade food gift.
Can You Use This Rum Sauce as a Cake Drip?
Because of the rum, this sauce is not quite as thick as a plain caramel sauce. For that reason, it may be too loose for a caramel drip cake. If you want to try using it as a drip, reduce the cream by 1/4 cup to make the sauce thicker. Always test the drip on the side of a chilled cake before adding it all over the top.
More Recipes You May Like
- Chocolate Caramel Sauce – a rich caramel sauce with chocolate.
- Rich Caramel Mud Cake – a caramel cake made with real caramel sauce in the batter.
- Microwave Lemon Curd – a quick and easy lemon curd.
- Baileys Mousse – a creamy mousse flavoured with Baileys Irish Cream.
- Gluten Free Caramel Slice – a slice with a crunchy base, thick caramel layer, and chocolate topping.
Rum Caramel Sauce
Ingredients
- ¾ cup cream (180ml)
- 2 cups sugar (400g), caster or superfine preferred
- ½ cup water (125ml)
- 2 tablespoons corn syrup or liquid glucose (40g), optional
- 2 tablespoons unsalted butter (about 25g)
- 1 teaspoon flaky sea salt
- ¼ cup dark or gold rum (60ml)
Instructions
-
Measure all ingredients and prepare your equipment before you begin.
-
Warm the cream in a microwave-safe jug for about 30 seconds. Set aside.
-
Combine the sugar, water, and corn syrup or glucose in a medium heavy-based saucepan. Stir gently until the sugar is moistened.
-
Place over medium-low heat and stir briefly while the sugar begins to dissolve. Brush down the sides of the pan with a wet pastry brush to remove sugar crystals.
-
Increase the heat and bring the syrup to a boil. Do not stir once it is boiling. Cook until it reaches a deep amber colour, about 170°C or 340°F. Gently swirl the pan if needed for even colouring.
-
Remove from the heat and carefully pour in the warm cream while stirring. The mixture will bubble and splutter.
-
Return the pan to medium heat and boil, stirring constantly, until the sauce reaches 115°C or 240°F. Without a thermometer, boil for a couple of minutes until slightly darker and thicker.
-
Remove from the heat. Whisk in the butter, then stir in the rum and most of the salt. Let a small spoonful cool, taste, and add more salt if needed.
-
Allow the sauce to cool before using. It will thicken as it cools.
-
Store in a sealed container in the refrigerator and reheat gently before serving.
Notes
Sugar: Caster or superfine sugar dissolves fastest, but regular granulated sugar is suitable.
Corn syrup or liquid glucose: Optional, but recommended to help prevent grainy caramel.
Salt: Add gradually and taste once the sauce has cooled slightly. Use less if substituting table salt.
Spiced variation: Add a few pinches of cinnamon, ginger, cardamom, pumpkin pie spice, or mixed spice when stirring in the rum.