Hot Fudge Sauce
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Spoon it warm over ice cream and watch it cool into a chewy, fudgy ribbon. It's cocoa and real chocolate, cooked until thick and sticky, and it keeps for two weeks. In this house, that's a theory.
The short version
Simmer sugar, cocoa and water, whisk in cream, corn syrup and half the chocolate, and boil until thick and sticky, 5 to 8 minutes. Off the heat, stir in the rest of the chocolate, butter and vanilla. Keep two weeks.
What makes ours better
why ours wins the argument at dinner
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Use cocoa and chocolate. Cocoa gives deep chocolate flavor and body, and chopped chocolate gives the silky, fudgy melt. Either one alone tastes thinner.
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Split the chocolate. Half cooks into the base for body; half melts in off the heat so it stays glossy and smooth instead of turning grainy or greasy.
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Boil it to 225°F. That's what makes the sauce firm up into a chewy fudge layer on cold ice cream instead of running off. No thermometer? Watch for small, tight bubbles and a sticky, thick syrup.
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Add a drop of vinegar. A quarter teaspoon is too little to taste, but it keeps the sugar smooth and lifts the chocolate.
What you need
the stars of the show
- Granulated sugar½ cup
- Unsweetened cocoa powder¼ cup
- Heavy cream1 cup
- Semisweet or bittersweet chocolate4 ounces
- Distilled white vinegar¼ teaspoon
- Unsalted butter4 tablespoons
- Vanilla extract1 tablespoon
yes, all of the butter
Steps
apron on. phone down. mostly.
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Prep the chocolate
Chop the chocolate fine and divide it into two equal piles of 2 ounces each. Cut the butter into pieces and set it by the stove with the vanilla.
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Whisk the base
In a large, heavy saucepan, whisk the sugar, cocoa and salt together, then whisk in the water until no dry cocoa remains. Bring to a simmer over medium-high heat.
Use a bigger pot than you think you need. The sauce bubbles up as it boils.
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Add cream and half the chocolate
Take the pan off the heat. Whisk in the cream, corn syrup, vinegar and the first pile of chocolate until the chocolate melts and the mixture is smooth.
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Boil until sticky
Return the pan to medium-high heat and boil, whisking often, until the bubbles are small and tight and the sauce is thick and sticky, 5 to 8 minutes. A candy thermometer should read about 225°F. Don't walk away; the bottom scorches quickly.
About 6 min. Cook mode has a timer for this step.
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Finish off the heat
Remove the pan from the heat and add the second pile of chocolate, the butter and the vanilla. Whisk until completely smooth and glossy.
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Cool and serve
Serve warm, about 10 minutes after cooking. It looks thin while hot and thickens as it cools; on cold ice cream it firms up into a chewy fudge layer.
About 10 min. Cook mode has a timer for this step.
Good to know
the stuff I’d tell you over the phone
- Chocolate matters here, so use one you'd eat. Chips work if that's what you have, but they contain stabilizers that can make the sauce slightly less silky.
- For a darker, less sweet sauce, use bittersweet chocolate. Both natural and Dutch-process cocoa work.
- The sauce looks right when it's thick enough to coat the back of a spoon while still hot. Cooking longer makes it firmer when cold.
- Storage. Cool, cover and refrigerate up to 2 weeks. It sets very thick; reheat only what you need in a small pan over low heat or in the microwave in 15-second bursts, stirring.
Questions, answered
asked and answered at the kitchen counter
Why is my hot fudge sauce grainy?
Usually the sugar didn't fully dissolve before the cream went in, or the sauce was overheated after the chocolate was added. Whisk the sugar into the water until you can't feel grit, and add the second batch of chocolate off the heat.
Why did my hot fudge turn hard in the fridge?
That's normal. Corn syrup and chocolate set up firmly when cold. Warm a few spoonfuls gently with a splash of cream or milk until pourable.
Can I make hot fudge without corn syrup?
Corn syrup is what gives this its chewy, sticky texture and keeps it smooth. Honey or golden syrup can stand in for it, though honey adds its own flavor.
How do I know when it's done without a thermometer?
Look for small, tight bubbles and a sauce that looks glossy and thick, coating the whisk. Put a spoonful on a cold plate for a minute; it should thicken noticeably.
Can I use milk instead of heavy cream?
It will still taste good, but the sauce won't be as rich or thick, and it may separate. Half-and-half works in a pinch.
Can I reheat it more than once?
Yes, but warm only the portion you're using each time. Repeated heating and chilling of the whole jar can make it clumpy.
From the table
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Published October 29, 2026.