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Asatsuyu

The 'natural gyokuro' - Asatsuyu cultivar produces extraordinary umami without shade-growing. Thick, sweet, and intensely savory from Kagoshima's volcanic soils.

Type
Green Tea
Origin
Japan · Kagoshima
Oxidation
none
Caffeine
high
Brew temp
60–70°C
Brew time
1–2 min
Flavor notes
umami, sweet, thick

History

Asatsuyu (あさつゆ, 'Morning Dew') is a rare Japanese tea cultivar prized as a 'natural gyokuro' - it produces extraordinary umami sweetness without the labor-intensive shade-growing that gyokuro requires. The cultivar was registered in 1953, developed from a natural seedling selection in Kagoshima prefecture on the southern island of Kyushu. Kagoshima has become Japan's second-largest tea-producing region (after Shizuoka), and its volcanic soils, warm climate, and long growing season produce distinctly different teas from the traditional Uji and Shizuoka styles. Asatsuyu is a fragile, low-yield cultivar that's difficult to grow, which is why it remains rare despite its exceptional cup quality. Tea connoisseurs seek it out specifically for its ability to deliver gyokuro-like richness at sencha processing levels.

Processing

Processed as a standard steamed sencha - no shade-growing required. The Asatsuyu cultivar naturally produces high levels of L-theanine (umami amino acid) and low levels of catechins (bitterness), mimicking the chemical profile that shade-growing creates in other cultivars. The leaves are steamed (futsuumushi or fukamushi), rolled into needles, and dried. Some producers use deep steaming (fukamushi) to further enhance the thick, rich character.

Tasting Notes

Appearance

Bright, vivid green needles with a glossy surface - the color is notably more vibrant than standard sencha. When brewed, the liquor is a deep, opaque jade-green with extraordinary intensity - almost like diluted matcha.

Aroma

Rich and sweet - fresh-cut grass, melon, and a pronounced marine sweetness. The aroma is heavier and sweeter than standard sencha, closer to gyokuro's intensity but with a distinctive fresh, dewy quality that inspired the cultivar's name.

Taste

Thick, sweet, and intensely umami - the 'natural gyokuro' reputation is well-earned. The cup is full-bodied and viscous with waves of marine sweetness, fresh melon, and a creamy mouthfeel. Despite the intensity, there's a fresh, bright quality that distinguishes Asatsuyu from true shade-grown gyokuro. Virtually no bitterness or astringency when brewed at proper temperature.

Brewing Guide

Western Style

  • Leaf: 3g per 200ml
  • Water: 60–70°C (140–158°F)
  • Time: 1–2 minutes
  • Infusions: 2–3 infusions

Gongfu Style

  • Leaf: 5g per 80ml
  • Water: 55°C (131°F)
  • Time: 60s first, +15s each subsequent
  • Infusions: 3–5 infusions

Step-by-step

  1. Use cool water. 60–70°C is essential - treat Asatsuyu like gyokuro, not sencha. The cool temperature extracts maximum umami. Tip: At 60°C, you'll taste pure sweetness and umami. At 80°C, you'll taste bitterness. Temperature matters enormously here.
  2. Prepare your kyusu. A small kyusu (150–200ml) works best. Warm it first, then add the leaves. Tip: For the most intense experience, try brewing in a hohin at 55°C with 5g per 80ml.
  3. Add 3g per 200ml. Standard proportions, but at cooler temperature. For a concentrated umami bomb, increase to 5g per 100ml. Tip: Asatsuyu leaves are slightly lighter in weight than typical sencha - adjust accordingly.
  4. Steep 60–90 seconds. The cool water needs time to extract. Watch for a deep jade-green liquor. Tip: If the liquor looks as intense as diluted matcha, you've nailed it.
  5. Second and third steeps. Increase temperature slightly (5–10°C) and reduce time to 45 seconds for the second steep. Tip: The second steep is often the sweetest. The third reveals more vegetal notes.

Health Benefits

  • Naturally high L-theanine content without shade-growing - exceptional for calm focus
  • Rich in catechins and antioxidants from Kagoshima's mineral-rich volcanic soils
  • The deep green color indicates high chlorophyll content
  • Contains vitamins C and E preserved by the steaming process
  • The cultivar's low catechin ratio makes it gentler on the stomach than typical sencha

Food Pairings

  • Delicate Japanese sweets (wagashi) - especially those with white bean paste
  • Fresh sashimi - the umami creates beautiful synergy
  • Light tofu preparations
  • Mild rice dishes like onigiri
  • On its own - like gyokuro, Asatsuyu is best appreciated without competing flavors

Buying Guide

What to look for

  • Labeled specifically as 'Asatsuyu' cultivar - not just 'Kagoshima sencha'
  • Bright, vivid green needles with noticeable sheen
  • Intense marine-sweet aroma in the dry leaf
  • Kagoshima origin - the cultivar performs best in its home terroir

Quality indicators

  • Single-cultivar (Asatsuyu) rather than blended with other cultivars
  • First flush spring harvest for maximum sweetness
  • Produced by specialists who understand the cultivar's unique requirements
  • Opaque, deep green liquor - not the clear yellow-green of ordinary sencha

Price range: $20–35 for standard Kagoshima Asatsuyu, $40–70 for premium single-farm, $80+ for competition-grade first flush

Storage: Refrigerate in an airtight, opaque container. Like gyokuro, Asatsuyu is best consumed fresh within 3–6 months of production.

Fun Facts

  • Asatsuyu means 'morning dew' - the name captures the fresh, dewy sweetness that distinguishes this cultivar.
  • Tea scientists have confirmed that Asatsuyu naturally produces amino acid levels comparable to shade-grown gyokuro - genetics accomplishing what shade-growing does artificially.
  • The cultivar is notoriously difficult to grow - it's susceptible to cold damage and diseases, which is why it remains rare despite its exceptional cup quality.
  • Kagoshima's Sakurajima volcano provides the mineral-rich ash that enriches the soil where Asatsuyu grows - the terroir is literally volcanic.
  • Some Kagoshima farmers are now shade-growing Asatsuyu to create an ultra-premium 'shade-grown natural gyokuro' - the result is almost absurdly umami-rich.

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