Salted Butterscotch Rum Sauce Recipe

Why You’ll Love This Recipe

• Silky, glossy butterscotch with deep toffee notes and a balanced hit of sea salt.
• Quick and reliable: 15 minutes on the stovetop with simple pantry staples.
• Dark rum and vanilla add warmth and complexity without overpowering.
• Perfect for drizzling or gifting; reheats beautifully and stays pourable.

Grocery List

• Produce: None
• Dairy: Unsalted butter, heavy cream
• Pantry: Dark brown sugar, vanilla extract, dark rum, flaky sea salt

Full Ingredients

Salted Butterscotch Rum Sauce

• 6 tbsp (85 g) unsalted butter
• 1 cup (200 g) packed dark brown sugar
• 3/4 cup (180 ml) heavy cream, warmed
• 2 tsp (10 ml) pure vanilla extract
• 2 tbsp (30 ml) dark rum
• 3/4 tsp flaky sea salt (plus a pinch more to taste at the end)

Step-by-Step Instructions

Step 1: Warm the cream

In a small saucepan or the microwave, warm the heavy cream until steaming but not boiling, about 150–160°F. Keeping the cream warm prevents it from shocking the hot sugar and causing lumps. Set it near the stove.

Step 2: Melt butter and bloom the brown sugar

In a medium heavy-bottomed saucepan (2–3 qt), melt the butter over medium heat. Sprinkle in the dark brown sugar and stir with a heatproof spatula until the mixture looks glossy and uniform. Let it bubble gently for 2–3 minutes, stirring frequently, until it smells nutty and butterscotchy and looks like a thick syrup.

Step 3: Add the warm cream carefully

Take the pan off the heat. Slowly stream in the warm cream while whisking constantly. The mixture will foam—keep whisking until smooth. Return the saucepan to medium heat.

Step 4: Simmer to thicken

Simmer the sauce, stirring often, for 3–4 minutes until it thickens slightly and coats the back of a spoon. For extra precision, cook to 220–225°F. The sauce will thicken further as it cools.

Step 5: Finish with vanilla, rum, and salt

Remove from heat. Whisk in the vanilla, dark rum, and 3/4 tsp flaky sea salt. For a softer alcohol edge, return to low heat and simmer 30–60 seconds, stirring. Taste and add a pinch more flaky salt if desired.

Step 6: Adjust consistency and strain (optional)

If the sauce seems too thick, whisk in 1–2 tsp warm cream. If too thin, simmer another minute. For an ultra-smooth finish, strain through a fine-mesh sieve into a heatproof bowl or measuring cup.

Step 7: Cool, jar, and serve

Let the sauce cool 10 minutes, then pour into a clean glass jar or a heatproof sauce boat. Serve warm and glossy, or let it cool completely before sealing and refrigerating.

Pro Tips

• Use a heavy-bottomed saucepan to prevent hot spots and scorching.
• Warm cream is key—cold cream can cause seized, grainy sauce.
• A thermometer takes out the guesswork: 220–225°F yields a pourable, glossy finish.
• Salt intensity varies by brand and crystal size; start with 3/4 tsp flaky salt and adjust to taste.
• For silky texture, strain the finished sauce and avoid overcooking past 230°F.

Variations

• Spiced Rum Butterscotch: Add 1/4 tsp ground cinnamon and a tiny pinch of nutmeg with the vanilla.
• Espresso Butterscotch: Whisk in 1–2 tsp instant espresso powder with the cream for a coffee-kissed finish.
• Booze-Free: Replace rum with 1 tbsp water plus 1/2 tsp molasses for similar depth.

Storage & Make-Ahead

Cool completely, then refrigerate in an airtight jar for up to 2 weeks. Reheat gently on the stovetop over low heat or in 10–15 second microwave bursts, stirring between intervals. If it thickens too much after chilling, whisk in 1–2 tsp warm cream to loosen. The sauce can be frozen up to 3 months; thaw overnight in the fridge and rewarm gently.

Nutrition (per serving)

Approximate per 2 tbsp: 170–180 calories; 10–11 g fat; 7 g saturated fat; 18 g carbohydrates; 17 g sugars; 90–150 mg sodium (varies by salt); 0–1 g protein.