Japanese Roasted Sweet Potato and Black Sesame Dip

Name: Japanese Roasted Sweet Potato and Black Sesame Dip
Prep time: 15 min
Cook time: 50 min
Total time: 1 h 5 min
Yield: 6 servings
Cuisine: Japanese
Ingredients: 1½ lb (680 g) Japanese sweet potatoes (murasaki or orange varieties), scrubbed clean, left whole with skin on; 3 tbsp (30 g) Black sesame seeds, toasted lightly if not already roasted (optional but enhances flavor); 2 tbsp (35 g) White miso (shiro miso), at room temperature; 1 tbsp (15 ml) Mirin (sweet rice wine); 2 tbsp (28 g) Unsalted butter, at room temperature, cut into small pieces; ½ tsp (2½ ml) Soy sauce (shoyu); to taste Sea salt; pinch White pepper, freshly ground (optional)

From the MyKitchenBank Kitchen

A silky, umami-rich dip combining roasted sweet potato with nutty black sesame, salty miso, and bright mirin. Inspired by traditional Japanese vegetable preparations, this dip delivers complex depth in a simple, elegant form. Serve warm or at room temperature with crackers, vegetable sticks, or grilled bread.

Prep: 15 min
Cook: 50 min
Wait: 10 min
Total: 1 hr 15 min
Makes: About 1½ cups (360 ml)

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Steps

Before you start

Preheat oven to 400°F (200°C)
Have a small bowl ready to toast sesame seeds if desired (optional but recommended)
Gather all ingredients and equipment before starting

1
Roast sweet potatoesOven 400°F / 205°C
- Line a baking sheet with foil.
- Pierce each sweet potato 3–4 times with a fork to allow steam to escape.
- Place on the prepared baking sheet.
- Roast at 400°F (200°C) for 45–50 minutes, until the flesh is completely soft and a knife glides through with no resistance.
- The skin will darken slightly.
- Remove from the oven and let cool for 10 minutes until comfortable to handle.
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Ready when: Flesh is very soft and a knife pierces it with no pressure
Tip: Don't cut the potatoes before roasting—keeping them whole preserves moisture and concentrates sweetness.
2
Scoop and mash potatoes
- Cut each cooled sweet potato in half lengthwise.
- Using a spoon, scoop the soft flesh into a large bowl, discarding the skins.
- Work while warm—the flesh will be easier to handle.
- Mash thoroughly with a potato masher or fork until mostly smooth, with just a few small lumps remaining.
- You should have about 1¼ cups (300 g) of mashed flesh.
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Ready when: Potatoes are broken down to a mostly smooth paste with minimal lumps
Tip: Warm mashed potatoes incorporate other ingredients more evenly; don't wait for them to cool completely.
3
Toast sesame seeds (optional)
- If using untoasted black sesame seeds, warm a small skillet over medium heat.
- Add the sesame seeds and stir constantly for 2–3 minutes until fragrant and slightly darkened.
- Pour onto a plate to cool for 1 minute.
- This step deepens their nutty flavor but can be skipped if using pre-toasted seeds.
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Ready when: Seeds become fragrant and slightly darker
Tip: Watch carefully—black sesame seeds burn easily. If you smell any burnt odor, immediately pour them out.
4
Blend in seasonings
- To the warm mashed sweet potato, add the white miso, mirin, butter, and soy sauce.
- Using a rubber spatula or wooden spoon, fold and stir gently but thoroughly until the mixture is completely combined and creamy.
- The butter will melt into the warm potato and create a silky texture.
- Fold in two-thirds of the toasted black sesame seeds (reserve the rest for garnish).
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Ready when: Mixture is evenly colored and creamy with no visible streaks of miso or butter
Tip: Don't overmix or the dip may become gluey. Fold gently until ingredients are just combined.
5
Season to taste
- Taste the dip.
- The miso and soy sauce provide saltiness, but add a small pinch of sea salt if it tastes flat.
- Add white pepper if desired for a subtle heat.
- Fold once more to distribute any final adjustments.
- The dip should taste sweet, umami-rich, and balanced—not overly salty.
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Ready when: Flavors are balanced and taste pleasant on a small spoon
Tip: Taste as you go; miso is salty, so proceed cautiously with additional salt.
6
Serve and garnish
- Transfer the dip to a serving bowl.
- Sprinkle the reserved black sesame seeds over the top.
- Serve warm or at room temperature with crackers, rice cakes, grilled bread, or raw vegetables such as carrots, celery, or cucumber.
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Tip: If the dip cools and becomes stiff, warm it gently in a microwave (10–15 seconds at 50% power) to restore creaminess.

Good to know

Tips

Choose Japanese sweet potatoes (murasaki, especially) for their fluffier texture and slightly chestnut-like flavor. Orange sweet potatoes work but are wetter and less delicate.
Black sesame seeds are available in Asian markets and online. They have a deeper, nuttier flavor than white sesame and look striking as a garnish.
This dip benefits from room-temperature or warm serving; cold straight from the fridge will be stiff. Let it sit at room temperature for 30 minutes or warm it gently.
Pair with Japanese crackers (senbei), vegetable sticks, grilled bread, or serve alongside sushi for a creative dipping sauce.

Make ahead

Prepare up to 1 day ahead. Cool completely, cover, and refrigerate. Reheat gently in a microwave or small saucepan over low heat, stirring often, until warm and creamy (2–3 minutes).

Storage & reheating

Refrigerator: up to 4 days in an airtight container. Freezer: up to 2 months. Thaw overnight in the refrigerator and reheat gently. The dip may separate slightly after freezing; stir well to recombine.

Substitutions

White miso (shiro miso) → Red miso (aka miso) or chickpea miso. Red miso is earthier and saltier; use 1½ tbsp (25 g) to avoid overpowering the dip. Chickpea miso offers a milder, slightly different umami base.
Mirin (sweet rice wine) → Honey or agave syrup. Use 1 tablespoon (15 ml). The dip will lose the subtle fermented sweetness of mirin but will still be delicious.
Black sesame seeds → White sesame seeds or a mix of black and white sesame. White sesame is milder and less nutty but adds the same textural element. Black sesame is irreplaceable for its flavor, so use it if possible.
Unsalted butter → Coconut oil (refined or unrefined) or sesame oil. Both add richness but change the flavor profile. Sesame oil (use 1 tbsp) intensifies the nutty notes; coconut oil keeps the dip more neutral.