Sweet Potato Tempura

Why You’ll Love This Recipe

I love this recipe because the light tempura coating complements the natural sweetness of the potato without covering it up. When I keep the batter cold and avoid overmixing it, I get a delicate, crispy shell instead of a heavy coating.

I also like how simple the ingredient list is. Most of what I need is usually already in my kitchen, and the sweet potatoes require very little preparation.

The finished tempura works as an appetizer, snack, or side dish. I can serve it with a traditional-style dipping sauce, spicy mayonnaise, or another favorite condiment.

Ingredients

(Tip: You’ll find the full list of ingredients and measurements in the recipe card below.)

For the sweet potato tempura:

• Sweet potatoes
• All-purpose flour
• Cornstarch
• Egg
• Ice-cold water
• Baking powder, optional
• Salt
• Neutral oil for frying

For the dipping sauce:

• Soy sauce
• Water or dashi
• Mirin
• Rice vinegar, optional
• Grated fresh ginger, optional
• Grated daikon, optional

I prefer cutting the sweet potatoes into thin, even slices so they become tender before the batter gets too dark. I also keep my water extremely cold because cold batter helps me create a lighter, crispier coating.

Directions

1. I wash and peel the sweet potatoes, although I can leave the skin on when I want additional texture.
2. I cut the sweet potatoes into slices about 1/4 inch thick. I try to keep the pieces similar in size so they cook at approximately the same rate.
3. I heat several inches of neutral frying oil in a deep, heavy-bottomed pot to about 340–350°F (170–175°C).
4. While the oil heats, I prepare the dipping sauce by combining soy sauce, water or dashi, and mirin. I add rice vinegar, ginger, or grated daikon when I want additional flavor.
5. In a bowl, I combine the flour, cornstarch, optional baking powder, and a small pinch of salt.
6. In a separate bowl, I lightly beat the egg with ice-cold water.
7. Just before frying, I pour the wet mixture into the dry ingredients and stir very briefly. I don’t try to make the batter completely smooth because a few lumps are perfectly fine for tempura.
8. I lightly coat each sweet potato slice in the cold batter and carefully lower it into the hot oil.
9. I fry only a few pieces at a time so the oil temperature doesn’t drop too much. I cook them for approximately 2–4 minutes, depending on thickness, until the coating is crisp and the sweet potato is tender.
10. I remove the tempura with a slotted spoon or spider strainer and transfer it to a wire rack or paper towel-lined plate.
11. I continue frying the remaining sweet potato slices, allowing the oil to return to the correct temperature between batches.
12. I season the tempura lightly with salt and serve it immediately with the dipping sauce.

Servings and Timing

This recipe makes approximately 4 servings.

Prep time: 15 minutes
Cook time: 15–20 minutes
Total time: approximately 30–35 minutes

I serve the tempura as soon as possible after frying because the coating is at its lightest and crispiest while freshly cooked.

Variations

For a vegan Sweet Potato Tempura, I leave out the egg and make the batter with ice-cold sparkling water, flour, and cornstarch. I find that sparkling water can also help create a particularly light coating.

When I want a sweet-and-spicy version, I serve the tempura with a dipping sauce made with sweet chili sauce or spicy mayonnaise.

For additional vegetables, I use the same batter for zucchini, mushrooms, broccoli, green beans, bell peppers, eggplant, or thinly sliced squash. I adjust the frying time according to the vegetable.

When I want extra crunch, I slightly increase the amount of cornstarch in my batter. I still keep the mixture thin enough to form a delicate coating.

For a simple finishing touch, I sprinkle the freshly fried sweet potatoes with flaky salt, sesame seeds, or a small amount of Japanese-style seasoning.

Storage/Reheating

I think Sweet Potato Tempura is best eaten immediately because the coating naturally loses some crispness as it sits.

If I have leftovers, I let them cool completely and place them in an airtight container lined with a paper towel. I refrigerate them for up to 2 days.

For reheating, I arrange the tempura in a single layer and warm it in an oven or air fryer at about 375°F (190°C) until hot and crisp again. I avoid stacking the pieces while reheating.

I don’t recommend microwaving tempura because the microwave tends to make the coating soft rather than crispy.

I also prefer not to freeze cooked tempura because the texture of the coating can deteriorate after freezing and thawing.

FAQs

Why isn’t my Sweet Potato Tempura crispy?

I usually check three things: the temperature of my batter, the temperature of my oil, and how much I mixed the batter. I keep the batter very cold, maintain the frying oil around 340–350°F (170–175°C), and stir the batter only briefly.

Do I need to cook sweet potatoes before making tempura?

No. I use raw sweet potatoes, but I slice them thinly so the centers have enough time to become tender while frying. Thick pieces can remain firm even after the batter has become crisp.

Can I make Sweet Potato Tempura without eggs?

Yes. I can make an egg-free batter with ice-cold water or sparkling water, flour, and cornstarch. I still keep the batter cold and prepare it immediately before frying.

What oil do I use for tempura?

I prefer a neutral oil with a relatively high smoke point, such as canola, vegetable, sunflower, or peanut oil. I avoid strongly flavored oils because I want the sweet potato and delicate batter to remain the main flavors.

What can I serve with Sweet Potato Tempura?

I like serving it with a soy-based tempura dipping sauce, spicy mayonnaise, sweet chili sauce, or simply a little salt. For a larger meal, I pair it with rice, noodles, miso soup, salad, or additional vegetable tempura.

Conclusion

Sweet Potato Tempura gives me an irresistible combination of crisp batter and soft, naturally sweet potato. I love how a few basic ingredients can create such a delicate texture when I keep the batter cold, maintain the right oil temperature, and fry the slices in small batches.

Sweet Potato Tempura

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Sweet Potato Tempura features thin slices of naturally sweet potato coated in a light, crisp tempura batter and fried until tender inside. Serve immediately with a simple soy and mirin dipping sauce for the best texture.

• Author: Laura
• Prep Time: 15 minutes
• Cook Time: 15-20 minutes
• Total Time: 30-35 minutes
• Yield: 4 servings
• Category: Appetizer
• Method: Deep Fry
• Cuisine: Japanese
• Diet: Vegetarian

Ingredients

• 2 medium sweet potatoes, about 1 pound total
• 3/4 cup all-purpose flour
• 1/4 cup cornstarch
• 1 large egg
• 1 cup ice-cold water
• 1/2 teaspoon baking powder, optional
• 1/4 teaspoon salt, plus more for serving
• 4 cups neutral oil, such as canola, vegetable, sunflower, or peanut oil, for frying
• 1/4 cup soy sauce
• 1/2 cup water or dashi
• 2 tablespoons mirin
• 1 teaspoon rice vinegar, optional
• 1 teaspoon grated fresh ginger, optional
• 2 tablespoons grated daikon, optional

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Instructions

1. Wash and peel the sweet potatoes, if desired, then cut them crosswise into even 1/4-inch-thick slices.
2. Pour the frying oil into a deep, heavy-bottomed pot and heat to 340–350°F (170–175°C).
3. Prepare the dipping sauce by combining the soy sauce, water or dashi, mirin, and optional rice vinegar. Stir in or serve with grated ginger and daikon if desired.
4. Whisk the flour, cornstarch, optional baking powder, and 1/4 teaspoon salt together in a bowl.
5. In a separate bowl, lightly beat the egg with 1 cup ice-cold water.
6. Immediately before frying, pour the egg mixture into the dry ingredients and stir only a few times. The batter should remain thin and slightly lumpy.
7. Dip each sweet potato slice into the cold batter, allowing excess batter to drip off.
8. Carefully lower a few battered slices into the hot oil without overcrowding the pot. Fry for 2–4 minutes, turning if needed, until the coating is crisp and pale golden and the sweet potato is tender.
9. Remove the tempura with a spider strainer or slotted spoon and drain on a wire rack or paper towel-lined plate.
10. Allow the oil to return to 340–350°F (170–175°C) and repeat with the remaining sweet potato slices.
11. Season lightly with salt and serve immediately with the dipping sauce.

Notes

• Keep the water and batter very cold and mix the batter only briefly for a light, crisp coating.
• Cut the sweet potatoes no thicker than 1/4 inch so they cook through before the batter becomes too dark.
• Fry in small batches to prevent the oil temperature from dropping significantly.
• For an egg-free version, omit the egg and use about 1 cup ice-cold sparkling water, adjusting slightly as needed to create a thin batter.
• The same batter can be used for zucchini, mushrooms, green beans, broccoli, bell peppers, or eggplant.
• Store cooled leftovers in a paper towel-lined airtight container in the refrigerator for up to 2 days.
• Reheat in a 375°F (190°C) oven or air fryer until hot and crisp. Avoid microwaving for the best texture.

Nutrition

• Serving Size: 1/4 of recipe
• Calories: 320 kcal
• Sugar: 7 g
• Sodium: 850 mg
• Fat: 15 g
• Saturated Fat: 2 g
• Unsaturated Fat: 12 g
• Trans Fat: 0 g
• Carbohydrates: 41 g
• Fiber: 4 g
• Protein: 6 g
• Cholesterol: 45 mg