Chef Takumi
Almond Tofu (杏仁豆腐, Annin Dōfu)
A cool square of almond-scented milk, set softly and served with mikan in thin syrup, is dinner-party food without theater. The only stern demand is restraint with the fragrance.
Culinary Explorer
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Sweet Potato (スイートポテト)
Created by
This is not the holiday casserole. Japanese Sweet Potato is a small yōgashi: roasted satsumaimo made smooth, shaped neatly, brushed with yolk, and baked until shiny.
Desserts
Japanese
Comfort Food
Make Ahead
Weeknight
25 min
Active Time
1 hr 10 min cook•1 hr 35 min total
Yield10 small cakes
Satsumaimo tells you when autumn has arrived. The skin goes wine-purple, the flesh turns golden, and the sweetness deepens enough that a careful cook only has to help it along. This Sweet Potato is yōgashi, Western-style Japanese confectionery, but the heart of it is very Japanese: choose the potato at its shun, then don't smother it.
The one detail that decides the dish is how you cook the satsumaimo. Roast it slowly, whole in its skin, and the flesh becomes sweet, dense, and fragrant. Boil it and you gain speed, yes, but you also wash away flavor and invite water into a sweet that should hold its shape. We are making a small cake, not mashed potatoes in a polite hat.
Once the potato is roasted, the work is plain. Mash it while warm, pass it through a sieve if you want the fine shop texture, then season with butter, sugar, egg yolk, cream, and a little mirin. The mirin is not decoration. It rounds the sweetness and gives the glaze a quiet shine. Pipe or spoon the mixture into small ovals, brush with yolk, and bake until the tops gleam. Honmono, but entirely within reach.
Japanese Sweet Potato is a Meiji-period yōgashi, a Western-style confection adapted to Japanese ingredients rather than imported whole. It is commonly traced to 1887, when confectioners began shaping satsumaimo into small baked sweets enriched with butter and egg yolk. The name stayed in katakana, スイートポテト, a sign of its Western pastry roots, though the flavor belongs plainly to Japan's roasted sweet potato season.
The technique, the tradition, and the story behind every dish.
Discover Culinary ExplorerIngredients
satsumaimo (Japanese sweet potatoes)
Quantity
600g
scrubbed, left whole
unsalted butter
Quantity
40g
softened
sugar
Quantity
45g
large egg yolks
Quantity
2
divided
heavy cream
Quantity
3 tablespoons
plus more as needed
mirin
Quantity
1 tablespoon
fine sea salt
Quantity
1/4 teaspoon
black sesame seeds (optional)
Quantity
1 teaspoon
| Ingredient | Quantity |
|---|---|
| satsumaimo (Japanese sweet potatoes)scrubbed, left whole | 600g |
| unsalted buttersoftened | 40g |
| sugar | 45g |
| large egg yolksdivided | 2 |
| heavy creamplus more as needed | 3 tablespoons |
| mirin | 1 tablespoon |
| fine sea salt | 1/4 teaspoon |
| black sesame seeds (optional) | 1 teaspoon |
Equipment Needed
- •Baking tray
- •Fine sieve or food mill
- •Piping bag with large star tip, or two spoons
- •Pastry brush
Instructions
- 1
Roast the potatoes
Heat the oven to 180°C, or 350°F. Prick the satsumaimo a few times, set them on a tray, and roast until a skewer slides through without resistance, 50 to 60 minutes. Slow roasting keeps the flesh dry and sweet. That dryness matters, because a wet mash slumps when you shape it.
- 2
Mash while warm
Split the potatoes while still warm enough to handle and scoop out the flesh. Mash it well, then pass it through a sieve or food mill for a fine texture. Warm potato takes in butter and yolk smoothly; cold potato fights you, which is unbecoming behavior from a tuber.
If the skins are neat, save a few small boat-shaped pieces and mound the filling back into them. That is a familiar Japanese shop style. - 3
Season the mash
Stir in the butter, sugar, one egg yolk, cream, mirin, and salt. The mixture should be smooth, thick, and pipeable, holding a soft peak when lifted with a spoon. Add cream a teaspoon at a time only if it feels stiff. Too much liquid steals the clean shape.
- 4
Shape the cakes
Line a tray with parchment. Spoon the mixture into a piping bag fitted with a large star tip, or shape it with two spoons into ten small ovals. Keep them restrained, about the size of a large walnut. Small sweets bake evenly and leave the potato's flavor clear.
- 5
Brush and bake
Beat the remaining egg yolk with 1 teaspoon water or mirin, then brush the tops lightly. Scatter with black sesame if using. Bake at 200°C, or 400°F, for 10 to 12 minutes, until the ridges are glossy and lightly browned. The glaze is there for shine and color, not a hard crust.
- 6
Cool and serve
Let the cakes rest on the tray for 10 minutes before moving them. They firm as they cool, and moving them too soon spoils the shape you just made. Serve warm or at room temperature, with green tea if you like the table to feel properly settled.
Chef Tips
- •Choose satsumaimo that feel heavy, with taut purple skin and no damp spots. Slender potatoes roast more evenly than fat ones, and the flesh turns sweeter without becoming waterlogged.
- •Do not replace satsumaimo with the orange American sweet potato and pretend it is the same sweet. It will be softer and wetter. Usable in need, yes, but the texture will move away from the Japanese shop cake.
- •A piping bag gives the familiar ridged top, but two spoons make a perfectly respectable oval. The shape should be neat and small, with nothing hidden under frosting.
Advance Preparation
- •Roast the satsumaimo up to two days ahead and keep them refrigerated in their skins. Warm the flesh gently before mashing so the butter blends cleanly.
- •The shaped unbaked cakes can be refrigerated for one day. Brush with yolk just before baking so the glaze stays even and shiny.
- •Baked Sweet Potato keeps two days refrigerated. Bring it to room temperature, or warm it gently in a low oven.
Frequently Asked Questions
Nutrition Information
1 serving (about 60g)
Calories
160 calories
Total Fat
5 g
Saturated Fat
3 g
Trans Fat
0 g
Unsaturated Fat
2 g
Cholesterol
55 mg
Sodium
65 mg
Total Carbohydrates
28 g
Dietary Fiber
2 g
Sugars
11 g
Protein
2 g
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