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A Matter of Concrete

/059 INDONESIA — RUKUN SAUDARA

£17.00

  • Zesty, Violets, Creamy, Blonde Raisin
Roast
Size
Roast Date

Only 3 left!

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Additional information

Coffee Details

Country of Origin
Indonesia
Region
Sumatra
Varietal
Sigararutang, Andungsari
Process
Honey
Roast Level
Medium-Light
Farm
Rukun Saudara Cooperative
Altitude
1400-1700 masl

What to expect

In the cup you can find

Zesty, Violets, Creamy, Blonde Raisin

Overall profile

Blonde raisin brings a soft, dried-fruit sweetness, followed by a creamy texture and floral violet character.

Sensory profile

Acidity
2/5
Body
3/5
Sweetness
4/5
Funk
2/3
Adventurous
3/5

About A Matter of Concrete

Rotterdam-based A Matter of Concrete combines sensory judgement with hard data to make deliberate decisions about sourcing and roasting. Working from the Van Nelle Factory, the team pairs exceptional coffee with a practical focus on innovation, traceability and lower-impact production.

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Roaster notes

Indonesia — Rukun Saudara Cooperative Andungsari & Sigararutang (Anaerobic Honey)

Tastes Like — 🍇 Blonde Raisin • 🥛 Creamy • 💜 Violets • 🍋 Zesty

DETAILS

  • Producer: Rukun Saudara Cooperative, led by Abdul Aziz Thohari
  • Region: Bengkolan Dua Village, Kerinci, Jambi, Sumatra
  • Varietal: Andungsari & Sigararutang
  • Process: Anaerobic Honey
  • Altitude: 1,400–1,700 masl

INTRO From Bengkolan Dua Village in Kerinci, Sumatra — an anaerobic honey from the Rukun Saudara Cooperative, grown in the volcanic soils surrounding Mount Kerinci. Rich and expressive without becoming heavy, blonde raisin brings a soft dried-fruit sweetness, followed by a creamy texture and floral violet character. In the cup: blonde raisin, creamy, violets, and zesty.

THE PRODUCER Abdul Aziz Thohari started growing coffee in 2015, at a time when much of the coffee from the area was still sold as wet parchment and transported to Medan for processing elsewhere. In 2017, he established Rukun Saudara, allowing local farmers to take control over quality and processing themselves — their first drying facility measured just 10 x 5 metres; today it covers approximately 800 square metres. The cooperative brings together around 50 farmers cultivating roughly 30 hectares on the high plateau surrounding Mount Kerinci, at 1,400 to 1,700 masl, benefiting from fertile volcanic soils created by one of Sumatra's most prominent active volcanoes.

This lot combines Andungsari, a compact, productive Indonesian variety known for sweetness, citrus-like acidity, and floral character, with Sigararutang, originating in North Sumatra and widely planted for its productivity and adaptability at altitude.

THE PROCESS Ripe cherries are pulped while leaving the mucilage around the seed intact, then fermented in sealed, oxygen-limited tanks before drying with the remaining mucilage still attached.

This combination of anaerobic fermentation and honey processing is the defining step — it's what increases the sweetness, texture, and fruit character behind the blonde raisin and violet notes, while maintaining structure and clarity.

THE CUP Rich and expressive without being heavy — blonde raisin brings a soft, dried-fruit sweetness, followed by a creamy texture and floral violet character. A zesty acidity runs throughout, keeping the cup lifted with a clean, energetic finish.

Flavour Notes 🍇 Blonde Raisin 🥛 Creamy 💜 Violets 🍋 Zesty

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Country of Origin

Indonesia, Asia

In this coffee

Blonde raisin brings a soft, dried-fruit sweetness, followed by a creamy texture and floral violet character.

  • Zesty
  • Violets
  • Creamy
  • Blonde Raisin

This lot’s process Anaerobic

About this origin Indonesia’s many islands, climates and processing traditions create a broad spectrum of flavour. Classic wet-hulled coffees can be rich, herbal and spicy, while modern washed and natural lots reveal bright fruit, florals and impressive clarity.

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Coffee Process

Honey

In this coffee

Blonde raisin brings a soft, dried-fruit sweetness, followed by a creamy texture and floral violet character.

  • Zesty
  • Violets
  • Creamy
  • Blonde Raisin

This lot’s process Anaerobic

How it works The cherry skin is removed, but some of the sticky fruit layer stays around the coffee seed while it dries.

Typical influence The cup can balance washed clarity with natural sweetness, sometimes bringing a rounded body and stone-fruit or caramel-like flavours.

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Coffee Varieties

  • Sigararutang
  • Andungsari

In this coffee

Blonde raisin brings a soft, dried-fruit sweetness, followed by a creamy texture and floral violet character.

  • Zesty
  • Violets
  • Creamy
  • Blonde Raisin

This lot’s process Anaerobic

About this variety

Several varieties make up this lot. That can create a layered cup, but their individual flavours cannot be separated honestly after the coffee is combined.

Why this one is different
  • Indonesia
  • Sumatra
  • 1400-1700 masl
  • Honey

These varieties were grown or combined in Indonesia. The producer’s lot details and tasting notes are the best guide to how they work together.

Honey or pulped-natural processing often adds roundness and sweetness while keeping some of the fruit definition of a washed coffee.

A little background

The varieties are shown exactly as supplied for this coffee. We do not invent one combined genetic or flavour profile for the group.

Classification Multiple varieties

Technical lineage Each listed variety has its own lineage.

Variety is a guide, not a flavour guarantee. Lot notes are more specific.

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