Sweet Potato Mash with Mint

Side DishVegetarianSweet Potatoes

Sweet potatoes cooked and mashed with onions, mint, cilantro, garlic, and olive oil. Puerto Rican boniato recipe.

Photography Credit: Elise Bauer

Have you ever had “boniato”?

It’s a sweet potato that is popular in the Caribbean. It’s light in color and fluffy when cooked.

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I first tried this sweet potato variety at a special food and wine festival event in the Bahamas. These fluffy sweet potatoes with mint were served alongside freshly caught wahoo fish, and as good as the fish was, I could have skipped it completely and just had a huge plate of the sweet potatoes, they were so good.

The chef who prepared the mash was Chef Sean Bernal of The Oceanaire Seafood Room Miami, who recalled to us how his grandmother in Puerto Rico would make him boniato sweet potato with onions and mint.

Chef Sean has generously shared with us how he prepared the mash. The trick, he says, is to roast the sweet potatoes so that you get the richness of flavor from the caramelization of the sugars in them. I prepared a couple batches, one boiled and one roasted, and I agree that the roasted approach produces more flavor.

Sweet Potato Mash with Mint

The real surprise was the combination of the sweet potatoes, crunchy raw chopped onions, and mint! I never would have thought to put mint with sweet potatoes, but it’s a great combination.

Regarding the boniato sweet potato. I think they are pretty easy to come by in places like Florida, but our local Whole Foods doesn’t carry them. So I used a Japanese variety of a pale yellow sweet potato instead, which worked fine. (Apologies to Chef Sean, but we make do with what we have, right?)

Another surprising touch was the addition of just a little bit of vanilla, it made the mash seem even creamier.

I honestly can’t remember if Sean added sugar or not, but if you like your sweet potatoes to be sweet, you can add a little to taste (I think we added one teaspoon for the whole 3 lb batch.)

Sweet Potato Mash with Mint Recipe

  • Prep time: 10 minutes
  • Cook time: 45 minutes
  • Yield: Serves 6


  • 3 pounds light yellow sweet potatoes (boniato if you can get them), peeled, cut into 2 inch chunks
  • 1/4 cup extra virgin olive oil
  • 1/2 cup to 1 cup (or more) water
  • 1/4 cup minced onion
  • 1/2 small garlic clove, minced
  • 1/4 cup chopped mint leaves, packed, (about 30-40 leaves)
  • 2 tablespoons minced cilantro, packed
  • Salt
  • Sugar
  • 1/4 teaspoon vanilla extract


1 Roast the sweet potatoes: Rub olive oil all over the sweet potato pieces, sprinkle lightly with salt, and put them in a roasting pan, cook at 425°F for 40 minutes, until cooked through and lightly browned and a fork easily pierces through the pieces.

2 Mash the sweet potatoes, add water: Place cooked sweet potato pieces in a large bowl, add olive oil, mash with a potato masher until completely mashed. Slowly add water, stirring with a wooden spoon until the sweet potatoes reach desired consistency.

3 Stir in the onions, garlic, mint, and cilantro. Stir in vanilla extract. Add more salt, and maybe a little sugar if you want, to taste.

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Recipe method told to Elise by Chef Sean Bernal of The Oceanaire Seafood Room Miami.

Elise Bauer

Elise Bauer is the founder of Simply Recipes. Elise launched Simply Recipes in 2003 as a way to keep track of her family's recipes, and along the way grew it into one of the most popular cooking websites in the world. Elise is dedicated to helping home cooks be successful in the kitchen. Elise is a graduate of Stanford University, and lives in Sacramento, California.

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10 Comments / Reviews

No ImageSweet Potato Mash with Mint

Did you make it? Rate it!

  1. Yana

    I made this with normal sweet potatoes (excluded the water and sugar to compensate for flavor/texture). I plan to make it again using boniatos, now that I’ve found them in the supermarket (they were well-hidden when I first looked), so I’ll post my thoughts on the difference. One question I had was, what’s the reason for peeling the potatoes? In the case of sweet potatoes, we happily eat the peel (in fact, I roasted the peels from the potatoes I used here with evoo, salt, and pepper, and had very yummy crisps to snack on), though I don’t know if there’s something about boniatos specifically that requires peeling…or is it just a preference for having peel-free mash? Thanks!

    Just a preference for a peel-free mash! ~Elise

  2. ladyarhlene

    I made this twice already around easter and passover in miami and just tonight..it was easy to find in miami and here in nyc we thought it would be tricky but found it at our western beef on 62nd st on the upper westside…we are vegetarians so it’s a great find for us…btw we hope we have the right boniato sweet potato it’s has a reddish skin right? anyway they label it as boniato at western beef and the publix in miami so it must be the one….we love this recipe thank you!


  3. Heidi

    To be honest, it was just okay. I wanted to stop after roasting the potatoes. They were great like that. My mash came out thick and I don’t know that I like so much mint in them. Had a hard time finishing it all. The bites with onion were yummy.

  4. charles

    I grew up eating these sweet potatoes. If you live near a heavily Vietnamese populated area, you’ll probably find these in the supermarket there. (So if you’re in Orange County, CA or Houston, Texas you’ll find these at the local Vietnamese supermarket.)

    My grandmother actually likes to peel these, slice them into 1/4 thick pieces and bake them. It cooks much faster sliced and then she takes it out, used a huge cleaver to pound it a little flat (kind of like how you pound garlic with a cleaver). Tastes amazing as a “thick chip”.

  5. Ash

    I LOVE Sweet Potato mash. In my area these potatoes are sold as “Korean Batatas”. Soft and sweet, perfect for a delicious mash. Thanks so much for featuring this wonderful vegetable.

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