Washed Process Coffee from Papua New Guinea's Sigri Plantation

Ever wonder how some washed coffees deliver such a crisp, clean taste with subtle earthy depth? That’s the profile many coffee professionals associate with highland-grown beans processed with precision — and one standout example comes from the remote highlands of Papua New Guinea. The answer lies in decades-old techniques and exacting post-harvest care, particularly at a little-known estate that's been perfecting its methods since the 1970s.

Sigri Plantation, located over 5,200 feet (1,600 meters) above sea level in the Papua New Guinea highlands, produces washed coffee using a traditional, multi-day fermentation and sun-drying method that results in a clean, sweet cup with a hint of earthiness. The entire process takes about 72 hours from harvest to dry parchment.

Where Is Sigri Plantation and Why Does Elevation Matter?

Sigri Plantation is nestled in the high-altitude terrain of Papua New Guinea’s mountainous interior. At approximately 5,200 feet (1,600 meters) above sea level, the estate benefits from cool temperatures and frequent rainfall — ideal growing conditions that slow cherry maturation and develop complex sugars in the coffee bean. These environmental factors play a big role in shaping the cup profile before processing even begins.

What Is the Washed (Fully Washed) Coffee Process?

The washed process, also called fully washed or wet processing, is a traditional method where coffee cherries are de-pulped, fermented to remove the mucilage, thoroughly washed, and then sun-dried. Unlike natural or honey processes, the washed method isolates the bean from the fruit early, creating a cleaner, more transparent cup. Sigri has refined this method for over 50 years, consistently producing coffees known for their clarity and balance.

How Does Sigri Process Its Coffee?

Sigri follows a meticulous, time-tested washed process:

• Harvest and Immediate Processing: Coffee cherries are processed the same day they’re picked to prevent spoilage and ensure a clean cup.
• De-pulping: The outer fruit is mechanically removed to isolate the coffee seeds (beans).
• Triple Washing & Fermentation (72 Hours Total):
  • Over three days, the beans undergo repeated washing and fermentation cycles.
  • They sit in fermentation tanks between washes, which helps break down the sticky mucilage.
  • After the mucilage is fully dissolved, the beans are given a final rinse in fresh water.
• Sun-Drying: The washed beans are spread out on large patios and turned regularly with rakes to promote even drying over several days.
• Sorting & Export: Once dried to the appropriate moisture level, the beans are hand-sorted, graded, and prepared for shipment and roasting.

This labor-intensive process results in a cup that’s bright, sweet, and layered with subtle earthy notes — a hallmark of well-executed washed processing.

What Does Washed Coffee from Sigri Taste Like?

The final cup from Sigri is described as deep and sweet, with a pronounced cleanliness rarely achieved in natural-processed coffees. Reviewers and roasters note a distinct earthy undertone alongside the expected bright acidity. This balance makes it versatile for filter brewing methods and even compatible with lighter espresso blends when carefully roasted.

Why Does Washing and Fermenting Take 72 Hours?

The extended 72-hour timeline — including three separate washes and fermentation intervals — allows for complete mucilage removal through both mechanical and microbial action. Each stage ensures the sticky layer around the bean is broken down without over-fermenting, which could introduce off-flavors. The final fresh-water soak ensures purity before sun-drying. This careful pacing preserves the bean’s inherent sweetness while encouraging complexity.

How Is the Coffee Dried and Prepared for Roasting?

After fermentation and rinsing, the coffee beans are spread in thin layers on large patios exposed to the sun. Workers regularly rake and turn the beans to ensure uniform drying. This drying phase can take several days, depending on weather. Only once the beans reach the ideal moisture content are they hand-sorted, graded, bagged, and prepared for export. The result is a clean, stable green coffee ready for roasters worldwide.

Frequently Asked Questions

Where is Sigri Plantation located?

Sigri Plantation is located in the highlands of Papua New Guinea, at an altitude of approximately 5,200 feet (1,600 meters) above sea level.

What coffee processing method does Sigri use?

Sigri uses a traditional fully washed (wet) processing method, where coffee cherries are de-pulped, fermented, washed, and then sun-dried on patios.

How long does the Sigri washing process take?

The complete washing and fermentation process at Sigri takes 72 hours, including three washing cycles and fermentation periods, plus a final fresh-water soak.

What does coffee from Sigri taste like?

Sigri coffee is described as clean, sweet, and deep, with a notable earthy undertone. It has a bright acidity balanced by smooth, lingering flavors.

Is Sigri coffee sun-dried or machine-dried?

Sigri coffee is sun-dried on large patios, where workers regularly turn the beans to ensure even drying over the course of several days.

Why is the washed process preferred for clean-tasting coffee?

The washed process removes the coffee fruit early, limiting fruit-induced fermentation and allowing the intrinsic qualities of the bean to shine through, resulting in a cleaner, more transparent cup profile.

Recommended FrontStreet Washed Process Coffees

For fans of the clean, bright, and subtly earthy profile of Sigri’s washed PNG coffee, FrontStreet Coffee offers excellent options. Their Kenya Little Tomato is a vivid washed coffee with intense fruit notes like Saint Mary’s tomato, black plum, and juicy acidity, perfect for those who enjoy a vibrant cup. Alternatively, try the Yirgacheffe-sourced Gedeb coffee (referred to in-house as Gedeb), which highlights floral and citrus brightness thanks to its meticulous washed processing. Both showcase the clarity and complexity achievable through high-quality washed methods. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.