One of my favorite healthy snacks to have lying around: Japanese Sweet Potato
One of my favorite healthy snacks to have lying around: Japanese Sweet Potato is a easy Japanese recipe that serves 2. 120 calories per serving. Recipe by Jon Kung on YouTube.
Prep: 10 min | Cook: 1 hr | Total: 1 hr 25 min
Cost: $3.50 total, $1.75 per serving
Ingredients
- 2 medium Japanese Sweet Potatoes (Murasaki variety, white flesh, about 300 g each)
- 1 tablespoon Chili Crisp (Optional topping for a spicy‑sweet contrast)
Instructions
Preheat Oven
Set the oven to 375°F (190°C) and let it fully preheat.
Time: PT5M
Temperature: 375°F
Prepare Sweet Potatoes
Rinse the Japanese sweet potatoes under cold water, scrub the skins with a brush, and pat dry. Using a knife, cut a small slit on the top of each potato to allow steam to escape.
Time: PT5M
Arrange on Baking Sheet
Place the potatoes directly on the baking sheet. If you prefer a softer skin, loosely wrap each potato in a sheet of aluminum foil; otherwise leave them uncovered for a drier skin.
Time: PT2M
Bake
Slide the sheet into the oven and bake for about 60 minutes, or until the potatoes are completely soft when pressed with tongs.
Time: PT1H
Temperature: 375°F
Cool Slightly & Serve
Remove the potatoes from the oven, let them cool for 5 minutes, then serve whole or sliced. Drizzle with chili crisp if desired.
Time: PT5M
Store Leftovers
Place the cooled potatoes in a tupperware container or resealable bag and refrigerate. They keep for up to 7 days.
Time: PT2M
Nutrition Facts
- Calories
- 120
- Protein
- 2 g
- Carbohydrates
- 27 g
- Fat
- 0 g
- Fiber
- 4 g
Dietary info: Vegan, Gluten-Free (use gluten‑free chili crisp)
Allergens: Soy (if using chili crisp that contains soy sauce)
Ingredient Substitutions
- Instead of Japanese Sweet Potatoes: Orange sweet potatoes, Regular russet potatoes (different texture)
- Instead of Chili Crisp: Sriracha, Spicy soy sauce, Hot sauce
Equipment Needed
- Oven
- Baking Sheet
- Aluminum Foil (optional)
- Tongs
- Knife
- Cutting Board
- Tupperware or resealable bag (optional)
Critical Steps — Do Not Skip
- Preheating the oven to the exact temperature (375°F).
- Baking for the full hour to achieve a fully soft, custardy interior.
- Checking for softness with tongs before removing from the oven.
Chef Tips from the Video
- For extra caramelization, brush the potatoes lightly with a drizzle of oil before baking.
- A pinch of sea salt sprinkled after baking enhances the natural sweetness.
Troubleshooting
Potatoes are still firm in the center after 60 minutes.
Increase bake time by 10‑15 minutes and check again; ensure oven temperature is accurate.
Skin is too soggy.
Bake uncovered for the last 10‑15 minutes or skip foil entirely.
Potatoes dry out too much.
Wrap loosely in foil for the entire bake or baste with a little oil halfway through.
Storage
Refrigerator: Place in an airtight container; keep up to 7 days.
Freezer: Not recommended – texture changes when frozen.
Room temperature: Only safe for a few hours; otherwise refrigerate.
Make-Ahead Tips
- Bake a batch and store in the fridge for quick snacks.
- Reheat in a toaster oven for a crispier skin.
Frequently Asked Questions
What is the cultural significance and history of Japanese sweet potatoes in Asian cuisine?
Japanese sweet potatoes, known as "Murasaki" in Japan, have been cultivated for centuries and are a staple snack throughout East Asia. Their creamy, custardy texture and natural sweetness make them popular street‑food items, especially in Taiwan where they are sold at convenience stores like 7‑Eleven.
How are Japanese sweet potatoes traditionally served in Japan and Taiwan?
In Japan they are often roasted whole and eaten plain or with a sprinkle of salt, while in Taiwan they are commonly sold hot from vending machines, sometimes brushed with butter or paired with spicy chili crisp for contrast.
What regional variations of baked Japanese sweet potatoes exist within Asian cuisine?
In Okinawa the sweet potatoes may be grilled over charcoal for a smoky flavor; in mainland China they are sometimes sliced thin and fried into chips. The basic baked whole version remains the most common across the region.
What occasions or celebrations feature Japanese sweet potatoes in Japanese or Taiwanese culture?
Japanese sweet potatoes are a popular autumn snack, often enjoyed during harvest festivals and as a comforting street food during cooler evenings. In Taiwan they are a common winter comfort food sold at night markets.
What authentic ingredients give Japanese sweet potatoes their unique custardy sweetness compared to orange sweet potatoes?
The Murasaki variety has a higher natural sugar content and lower starch, which caramelizes during baking to produce a chestnut‑like, custardy sweetness. Traditional recipes rely on the potato alone, without added sugars.
What other Asian dishes pair well with baked Japanese sweet potatoes?
They complement miso‑glazed fish, grilled teriyaki chicken, or a simple bowl of rice and pickled vegetables. A drizzle of sesame‑soy dressing or a side of kimchi also works beautifully.
What are the most common mistakes to avoid when making baked Japanese sweet potatoes?
Common errors include under‑baking (resulting in a hard center), wrapping tightly in foil which traps moisture and makes the skin soggy, and not preheating the oven fully. Follow the critical steps for timing and skin texture.
Why does this recipe suggest baking at 375°F instead of a higher temperature?
Baking at 375°F allows the interior to become fully soft and custardy while giving the skin enough time to dry out slightly without burning. Higher temperatures would crisp the skin too quickly and leave the center undercooked.
Can I make baked Japanese sweet potatoes ahead of time and how should I store them?
Yes, bake a batch, let them cool, then store in an airtight container in the refrigerator for up to 7 days. Reheat in a 350°F oven for 10‑15 minutes or microwave briefly to restore warmth.
What does the YouTube channel Jon Kung specialize in?
The YouTube channel Jon Kung focuses on simple, approachable Asian street‑food and home‑cooking tutorials, often highlighting quick snack‑style recipes and practical tips for busy cooks.
How does the YouTube channel Jon Kung's approach to Asian snack recipes differ from other cooking channels?
Jon Kung emphasizes minimal ingredients, quick preparation, and authentic flavor pairings like chili crisp, while many other channels may use more elaborate techniques or Westernized twists. His videos often showcase pantry‑friendly, ready‑to‑eat snacks that can be made in under an hour.
Last updated: August 24, 2026
