Fried Hollow Sweet Potato Balls Snack
Crispy on the outside, soft, chewy and tender on the inside, this Fried Hollow Sweet Potato Balls Snack, which is known in Thai as “Kha Nom Khai Toa” (meaning, “Tortoise Eggs”), is a delightful snack with a hollow centre. It’s light and airy, with the natural sweetness of sweet potatoes and a hint of creaminess from the coconut cream.
It is one of the nostalgic snacks I used to enjoy as a kid from the street vendors back in my hometown. Although quite easy to do, there are a few steps to take – yet, the result is bountiful and super worth it! Even the dough can be prepared well in advance – simply thaw and fry when it’s time to eat it!
The crispy skin and chewy insides make this a deliciously addictive snack for any occasion! Serves 12 to 15 adults.
Ingredients
Sweet potatoes – I used both orange and purple sweet potatoes, to get different-coloured Sweet Potato Balls. As both of them are equally delicious, either of them can be used if you prefer to make only one colour. It comes down to personal preference. If using only one type, do reduce the Flour Mix ingredients by half. They are first steamed to be fully cooked, before mashing them finely through a mesh colander/ sieve to remove any fibrous centre.
Tapioca flour makes up the “body” of the Sweet Potato Balls. It gives this snack its chewy, soft interior texture.
Cornstarch, or corn flour, helps to bind all the ingredients together. A little is sufficient for this recipe.
Sugar helps to sweeten the Sweet Potato Balls a little. Use granulated, or superfine sugar, so that it dissolved easily while making the dough.
Baking powder helps the dough rise while deep-frying, making a lovely hollow centre for the Sweet Potato Balls. This makes them light and very airy.
Salt, to taste.
Coconut Cream gives a lovely fragrance and richness to the snack. The coconut cream is the layer that floats to the top when the coconut milk settles. It is creamy, fatty and full of flavour, enhancing the taste of the Sweet Potato Balls.
Cooking oil, for deep frying.
Steps
Here are the brief steps to make Sweet Potato Balls:
- Peel the sweet potatoes.
- Steam the sweet potatoes.
- Make the flour mixture.
- Smash the steamed sweet potatoes.
Tips
- The smaller the sweet potato pieces, the faster the cooking time.
- If you have one type of sweet potato, cut the flour mix measurements in half.
- The sweet potatoes are thoroughly cooked when a fork can be poked through them easily.
- While still warm, smash the sweet potatoes. The finer the mash, the smoother the dough. If the pieces have cooled and hardened, place them back onto the steamer for about 5 minutes to warm and soften them again.
- The dough should resemble clay, or play-doh. It should not be too soft, or too wet. It should be quite easy to roll a small portion into a ball.
- Extra dough should be wrapped tightly in cling wrap, and kept for up to 3 days in the fridge, or 5-6 weeks in the freezer.
- Using a large strainer to gently press down while swirling and frying the sweet potato balls encourages a large air pocket to form in the middle, creating a hollow centre.
- Make sure to watch the full video to see how I made it exactly!
Storage Instructions
As with all deep-fried snacks, these Sweet Potato Balls are best enjoyed immediately after frying. It is not recommended to keep or store after frying as the crispy exterior will deflate, and it will appear oily.
However, the dough can be kept, wrapped airtight, in cling wrap, in the fridge for no more than 3 days. It can be kept in the same manner, frozen, for up to 5 to 6 weeks in the freezer. Simply bring to room temperature before making into rolled balls (if kept in the fridge), or thaw for 2 to 3 hours if frozen.
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Fried Sweet Potato Balls
Equipment
- Steamer
- Sharp Knife
- Chopping Board
- Colander
- Wok
- Strainer
- Cooling Rack
Ingredients
- 600 g orange sweet potato, peeled & chopped
- 550 g purple sweet potato, peeled & chopped
- 500 ml cooking oil, for deep frying
- 270 ml coconut cream
Flour Mix
- 300 g tapioca flour
- 20 g corn flour, cornstarch
- 120 g sugar, granulated
- 1/4 tsp baking powder
- 1/2 tsp salt
Instructions
- Prepare a large steamer over medium heat, with enough water to steam for 45 minutes.
- Peel the skin from both the orange and purple sweet potatoes. Remove both ends from each of the sweet potatoes. Cut them into small pieces, about 2-inch square in length. Give them a quick rinse to remove the debris.
- Once the water is vigorously boiling, steam the sweet potatoes for 45 minutes, or until a fork can be poked through easily.
- Meanwhile, mix together the tapioca flour, corn flour (cornstarch), granulated sugar, baking powder and salt in a large mixing bowl until well combined with a whisk. Set it aside.
- Once the sweet potato pieces are done, remove them from the heat. Smash the orange sweet potato pieces through a fine mesh colander, or strainer, scraping the outer side often. When done, set aside. Wash the fine mesh thoroughly, and repeat for the purple sweet potatoes.
- Add half of the flour mix to the smashed orange sweet potato, and mix thoroughly. Then, add 80ml of coconut cream to the mixture, and knead until it resembles a dough. Add 30ml of coconut cream, kneading until well combined. If it is too dry, add another 10ml of coconut cream. The dough should not be sticky or wet – it should resemble clay or play-doh. Set aside the amount that will be used, and wrap the rest in cling wrap tightly.
- Repeat with the smashed purple sweet potato. Mix in the rest of the flour mix. Pour 100ml of coconut cream, kneading until combined. Add 25ml of coconut cream each time, until the dough is soft and resembles the consistency of play-doh. Set aside the amount that will be used, and wrap the rest in cling wrap tightly.
- Roll the orange dough into long cylinders, before cutting them evenly, roughly about the same size as a ping pong ball. Roll each of the pieces into spherical shapes, and set them aside on a large plate. Repeat for the purple dough as well.
- Over medium heat, pour 500ml of cooking oil, or sufficient to submerge the potato balls, into a wok. Let it heat up for about 3-4 minutes. Once the oil is warmed, add the orange balls one at a time, until 1/3 of the wok is filled. Let them cook for about 20 seconds.
- Stir and turn the sweet potato balls for about 7-8 minutes over medium heat, continuously using a large strainer to gently press down and swirl the balls while frying. After 8 minutes, or until golden brown, remove them with the strainer, shaking off any excess oil and let them rest in a cooling rack. Repeat with the 2nd and 3rd batches of sweet potato balls, cooking each of them for 8 minutes.
- Serve immediately.
Video
Notes
- The smaller the sweet potato pieces, the faster the cooking time.
- If you have one type of sweet potato, cut the flour mix measurements in half.
- The sweet potatoes are thoroughly cooked when a fork can be poked through them easily.
- While still warm, smash the sweet potatoes. The finer the mash, the smoother the dough. If the pieces have cooled and hardened, place them back onto the steamer for about 5 minutes to warm and soften them again.
- The dough should resemble clay, or play-doh. It should not be too soft, or too wet. It should be quite easy to roll a small portion into a ball.
- Extra dough should be wrapped tightly in cling wrap, and kept for up to 3 days in the fridge, or 5-6 weeks in the freezer.
- Using a large strainer to gently press down while swirling and frying the sweet potato balls encourages a large air pocket to form in the middle, creating a hollow centre.
- Make sure to watch the full video to see how I made it exactly!