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Sweet Potato Mustard and Cosmic Dogs

Sweet Potato Mustard is a must make condiment for any sweet potato lover. It’s quite famous at Jack’s Cosmic Dogs in Mount Pleasant, SC where their Cosmic Dog comes with sweet potato mustard and blue cheese coleslaw.

Sweet Potato Mustard- great on hot dogs and sandwiches


Yesterday I shared a Blue Cheese Bacon Coleslaw recipe that’s my interpretation of their slaw. There’s doesn’t have bacon, but who can object to the addition of bacon to anything? Not me.

Sweet Potato Mustard - great on hot dogs and sandwiches

If you’re ever in the Charleston area (and everyone should be at some point in their life 🙂 ) go to Jack’s Cosmic Dogs and eat a dog or two.  Alton Brown of the Food Network declared the Cosmic Dog to be one of the best things he’s ever eaten.

Jack's Cosmic Dogs in Mount Pleasant, SC

Now I have no idea how they make their sweet potato mustard. The recipe is probably hidden in one of the rockets and missiles that decorate the restaurant grounds.

Cosmic Dog at Jack's Cosmic Dogs in Mount Pleasant, SC

Cosmic Dog at Jack’s

But I knew I wanted to make sweet potato mustard, because you have to admit, it sounds like one of the coolest things ever right? I searched the internet and found a wonderful recipe for sweet potato mustard from The Runaway Spoon. By the way, the blogger behind The Runaway Spoon blog just published a cookbook, Pimento Cheese: The Cookbook: 50 Recipes from Snacks to Main Dishes Inspired by the Classic Southern Favorite. I totally spent 20 minutes at Books a Million last week crushing over it. It’s at the top of my Christmas wish list. 🙂

Cosmic Dogs Recipe

Anyways, I made the sweet potato mustard (with a few slight changes) and the result was a delicious mustard with a fabulous color from the sweet potatoes. It’s flavored with bourbon, brown sugar, Pure Cane Sorghum, and cinnamon. Perfect for fall!

To make a Cosmic Dog copycat, top a hot dog with sweet potato mustard and some of this Blue Cheese Coleslaw.

You need not stop with just adding sweet potato mustard to hot dogs. Try it on a turkey or ham sandwich for a little something out of the ordinary. And a great conversation starter!

Cosmic Dogs with Blue Cheese Coleslaw and Sweet Potato Mustard

Sweet Potato Mustard- great on hot dogs and sandwiches

Sweet Potato Mustard

Homemade mustard flavored with sweet potatoes, bourbon, brown sugar, and cinnamon.


  • 1/2 cup apple cider vinegar
  • 1/3 cup yellow mustard seeds
  • 1 bay leaf
  • 1 cinnamon stick
  • 1 cup water
  • 2/3 cup sweet potato puree
  • 1 tablespoon sorghum syrup or light molasses
  • 1 tablespoon bourbon
  • 1/4 cup packed brown sugar
  • 2 tablespoons ground mustard
  • 1/2 teaspoon sweet paprika
  • 1/2 teaspoon kosher salt
  • pinch of allspice
  • pinch of cayenne


  • In a small saucepan, bring vinegar to a boil. Remove from heat and add the mustard seeds, bay leaf, and cinnamon stick. Make sure the bay leaf and cinnamon stick are submerged in the vinegar. Place the lid on the pot and let sit for 1 hour.
  • Discard the bay leaf and cinnamon stick. Use a spoon to scrape all of the mustard seeds along with the vinegar into a blender.
  • Add the water, sorghum, and bourbon. Blend until smooth. (Mine didn't get smooth. It ended up more like a coarse ground mustard, but I do have a pretty pathetic blender.)
  • Add sweet potato puree and blend until smooth.
  • Pour the mixture back into the pan and bring to a boil. Reduce heat to medium-low and boil gently, stirring frequently, for about 5 minutes.
  • Whisk in sugar, ground mustard, paprika, salt, allspice, and cayenne pepper.
  • Continue to simmer until mixture is thick, about 10 minutes.
  • Store in refrigerator.


Mustard may taste bitter at first. Place it in the refrigerator for a day or two and the bitterness should lessen.
Author: Christin Mahrlig
Course: Condiment
Cuisine: Southern

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18 thoughts on “Sweet Potato Mustard and Cosmic Dogs”

  1. John Hawkins

    We have a restaurant here in Cape Coral, FL. called Duffy’s and that is when I found out about this mustard. I chose another hot dog, but next time I will try the Sweet Potato Mustard.

  2. Combine this with Jack’s Blue Cheese Slaw with a Sabrett Hot Dog on a steamed split top hot dog bun and you have just checked a box on your bucket list!

  3. From around 1997-2002 Walmart use to sell a brand of sweet potato mustard. If I knew then, what I know now (that they would stop carrying it and I would not be able to find it anywhere) I would have bought at least 4 or 5 cases. Great on hot dogs, smoked sausage, as a great replacement for mayo or miracle whip it was the go to condiment that needed no relish, ketchup or anything else once added. I believe it hailed from Georgia and if I ever find it again,,, I saw the Cosmic dog bottled sweet potato mustard on Amazon, they wanted 25.00 Hope that was by the case (looked like it was by the jar) if not, I hope that dern stuff, walked on water, made its own sandwish and mowed lawns….

  4. Lindsey @ American Heritage Cooking

    I don’t even know how to think about this mustard! All I know is that it sounds delicious! You find the most unique places to eat!

  5. Jess @ On Sugar Mountain

    I want to make this mustard and slather it on all my food this Autumn. I’ve never even heard of sweet potato mustard but DUDE I must have it. 😀 Pinned!

  6. Thalia @ butter and brioche

    Never would have thought to make my own mustard before.. especially a sweet potato flavoured mustard. This looks incredibly delicious, great recipe!

  7. Ella-HomeCookingAdventure

    This sounds like a prefect recipe for using sweet potatoes. I really like it.

  8. Wow, what an awesome idea! I love sweet potatoes and sweet potato mustard sounds amazing especially on those hot dogs!

  9. Okay, I learned a lot reading this post! I just love sweet potatoes and this very idea of a sweet potato mustard sounds amazing! And now I’ve got to go to Charleston one day and have a Cosmic Dog!

  10. I need to make this! I love sweet potatoes and it sounds like I would love such flavor.. 🙂

  11. sweet potato mustard sounds like the best thing ever!! Two of my favorite things turned into one awesome condiment that I would want to put on everything! It looks amazing!

  12. Gayle @ Pumpkin 'N Spice

    I always love your creative recipes, Christin! Who knew that sweet potatoes would go so well in mustard? Sounds delish!

  13. What an interesting combination of flavors…so inviting! I am going to have to try this…not to mention the blue cheese coleslaw. 🙂

  14. Love the addition of the sweet potatoes to this mustard! Such a fun idea and it looks perfect with the hotdogs. Pinning!

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