About this wine
Château Mercian Koshu Kiiroka is a landmark wine that redefined the potential of Japan's indigenous Koshu grape. Developed in collaboration with the University of Bordeaux, this wine utilizes specific yeast strains to highlight the 'Kiiroka' (yellow aroma) profile—a distinct citrusy, grapefruit-like bouquet reminiscent of Sauvignon Blanc. Characterized by crisp acidity, elegant structure, and a refreshing clean finish that showcases the purity of the fruit, this wine has played a pivotal role in elevating the international reputation of Japanese viticulture, proving that Koshu can produce world-class, aromatic dry white wines.
If you have never tried Japanese wine before, this is the perfect place to start. Refreshing, aromatic, and easy to drink, it pairs beautifully with everyday Japanese food. Think of it as Sauvignon Blanc's elegant Japanese cousin—bright citrus aromas with a clean, dry finish.
Sommelier's Note
"The definitive benchmark for Koshu—this wine single-handedly proved that Japanese terroir can produce world-class aromatics. Every serious wine lover must taste it at least once."
Food Pairings
Pairs exceptionally well with fresh seafood including sashimi, oysters, and grilled fish. Its vibrant citrus acidity cuts through tempura batter beautifully. Also excellent with goat cheese, yuzu-dressed salads, and lightly herb-seasoned chicken. The wine's natural salinity makes it a superb companion for sushi.
When to drink it
Ideal for summer terrace dining, celebratory seafood dinners, Japanese cuisine appreciation evenings, or as a sophisticated gift for wine enthusiasts. A must-have at any Japanese wine tasting and an excellent introduction to the diversity of Asian wines.
Specs
- Grape Varieties
- Koshu
- Style
- White
- Price Range
- ¥2,500-3,500
Terroir & Winemaking
Made from 100% Koshu grapes grown in the Katsunuma area of Yamanashi Prefecture. Fermented at low temperatures to preserve volatile thiols, particularly 3-mercaptohexan-1-ol (3MH) and 3-mercaptohexyl acetate (3MHA), which are responsible for the characteristic grapefruit and passion fruit aromas. The winemaking process was developed through joint research with the University of Bordeaux, focusing on selecting specific yeast strains that enhance thiol expression in Koshu. Winemaking minimizes oxidation throughout to maintain the delicate citrus aromatics.
Frequently Asked Questions
- What does 'Kiiroka' mean?
- Kiiroka (きいろ香) literally means 'yellow aroma' in Japanese. It refers to the distinctive citrusy, grapefruit-like fragrance produced by volatile thiols (sulfur compounds) in the wine, developed through joint research with the University of Bordeaux.
- What does it taste like?
- It tastes like fresh grapefruit, yuzu, and green apple with a crisp, dry finish and refreshing acidity. The style is similar to a Sauvignon Blanc, but with a more delicate and elegant character unique to Koshu.
- What food pairs best with this wine?
- It pairs best with Japanese seafood dishes—particularly sashimi, tempura, and sushi—but also works beautifully with goat cheese, light chicken dishes, and yuzu-dressed salads.
- Should this wine be aged?
- It is best enjoyed young, within 2 to 3 years of the vintage, to fully appreciate its vibrant aromatics and fresh citrus character. The thiols that give it its signature aroma tend to diminish with extended cellaring.
- Is Koshu the same grape as other well-known white wine grapes?
- No, Koshu is a unique grape variety indigenous to Japan, grown primarily in Yamanashi Prefecture. It belongs to Vitis vinifera but has a distinct genetic lineage, producing wines with delicate aromas and crisp acidity quite different from European varieties.
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