The Ultimate Jagabutter Guide: Made with “Inca no Mezame”
1. What is Jagabutter?
Jagabutter (Butter Baked Potato) is a traditional Japanese comfort food and a classic street-food staple at local festivals (matsuri). It is enjoyed by topping piping-hot potatoes with a generous dollop of butter and adding a slight dash of salt or soy sauce.
While it is similar to Western baked potatoes, in Japanese izakaya (pubs) and at festival stalls, it is loved as a “supreme delicacy” crafted to bring out the maximum natural sweetness and savory aroma of the ingredients.
2. The Charm of the “Phantom Potato”: Inca no Mezame (The Golden Treasure: Inca no Mezame)
Because it is a simple dish, using a special potato variety elevates it into an extraordinary culinary experience. The potato used for this recipe is a premium variety known as the “phantom potato.”
- Nutty & Sweet Flavor: A small-sized potato created in Hokkaido by breeding native species from the Andes. It has an exceptionally rich, intense sweetness—often compared to chestnuts or sweet potatoes—that you would never expect from an ordinary potato.
- Vibrant Golden Flesh: It contains about seven times more carotenoids than standard potato varieties, giving it a vibrant color that instantly stimulates the appetite.
- Rare & Premium: Because it is extremely difficult to cultivate and harvest, its production volume is limited. In Japan, it is often called the “Phantom Potato.”
3. The Secret to Unlocking Its Flavor: “Oven Roasting” (Why Oven Roasting?)
While steaming is the standard way to prepare Jagabutter, for this special potato, “roasting it skin-on in the oven” is the absolute best method.
- Maximizing Sweetness: By heating it slowly starting from a low temperature, the starches convert into sugars, drawing out its sweetness to the absolute limit.
4. Recommended Toppings (Variations to Try)
- Salt & Soy Sauce: The rich creaminess of the butter and the savory aroma of soy sauce make a perfect match.
- Salted Squid (Shiokara): The authentic, classic Hokkaido style. The saltiness and umami of the squid enhance the natural sweetness of the potato even further.
- Spicy Pollock Roe & Mayonnaise (Mentaiko / Mayo): A popular topping combination frequently enjoyed at izakaya pubs.
NUTRITION FACTS
| Calories | Protein | Total Fat | Carbs | Sodium |
| 246 kcal | 3.3g | 16.4g | 31.1g | 1.4g |
INGREDIENTS (2 Servings)
- Inca no Mezame Potatoes: 180g (or any small, buttery potato like Yukon Gold)
- Butter: 20g
- Salt: 1g
- Optional: Black pepper, minced garlic, or a dash of soy sauce for an extra umami kick.
COOKING INSTRUCTIONS
- Prep: Wash the potatoes thoroughly. Cut them into bite-sized pieces, keeping the skin on to preserve the nutrients and flavor.
- Arrange: Line a heatproof dish with aluminum foil and arrange the potato pieces in a single layer.
- Season: Sprinkle salt evenly over the potatoes and top with knobs of butter.
- Slow-Roast: Place in the oven and bake at 250°C (482°F) for 40 minutes (no preheating required). The slow rise in temperature helps unlock the potato’s natural sugars.
Hungry for More Potato Inspiration? If you loved this “Inca no Mezame” recipe, you’ll enjoy exploring the incredible versatility of potatoes in Japanese cuisine. From comforting home-cooked classics to creative modern twists, check out my curated collection of potato recipes here:[Recommended recipes using Jagaimo potatoes]
Read the Japanese version of this article here! [【至高のじゃがバター】幻の芋「インカのめざめ」で作るオーブンロースト｜]
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