Rumble - Kensington
Welcome to Rumble Coffee!
"Rumble Coffee Roasters was born in Melbourne in 2014 to roast knock-out coffee and build a better, fairer coffee industry. We're all about bold flavours, full transparency, and strong relationships with producers. As a certified B Corp, we’re serious about doing right by people and the planet, without compromising on taste."


"Our most popular blend, Shadow Boxer tastes like coffee. It's bold and rich, with classic dark chocolate and hazelnut flavours, and a syrupy toffee finish. A standout for those who love a powerful coffee."
Components:
50% - Brazil Santo Antonio
50% - Ethiopia Haider Abamecha
Roast date - 10/08/2026
Variety - Mundo Novo, Catucai | Gibrinna 74100
Process - Natural | Washed
Flavour notes - Dark chocolate, Toffee, Raspberry

"Our fruitiest blend. Balanced enough for milk, bold enough to shine on its own. Perfect for the home barista chasing something special."
Components:
50% - Colombia Lengupá
25% - Ethiopia Haider Abamecha
25% - Guatemala El Panal
Roast date - 10/08/2026
Varieties - Caturra, Castillo, Colombia | JARC 74110 | Bourbon, Caturra
Process - Washed | Natural | Natural
Flavour notes - Berries, Cocoa, Mandarin

"Jhonaton Gasca is a new-generation coffee producer from Huila, Colombia, reshaping his family’s legacy through innovation and sustainability. Rooted in the tradition yet driven by unwavering curiosity, his coffees balance precision with a fresh sense of what’s possible for the industry. Every decision on the farm is guided by flavour, environmental care and long-term quality, resulting in refined and expressive coffees that reflect Jhonatan’s heritage and his forward-thinking vision.
Raised in Bruselas, Jhonatan shifted from a quantity-first mindset after studying ecological agriculture and returning from a near-professional soccer career. Under the Zarza Coffee name, his washed process is anything but standard. Ripe cherries are hand-picked, floated, sealed for 24-36 hours, pulled, open-fermented, then finished with a thermal shock wash to stablise both sugars and aromatics. Alongside biodiversity initiatives like beekeeping, Zarza Coffee delivers elegant coffees loved all over the world."
Producer - Jhonatan Gasca
Farm - Bella Vista
Origin - Bruselas, Huila, Colombia
Altitude - 1750-1800 MASL
Roast date - 10/08/2026
Varieties - Castillo, Caturra, Colombia
Process - Washed
Flavour notes - Milk chocolate, Orange, Peach

"Kabumbu is located in the foothills of extinct volcano, Mt Kenya. Owned/managed by Joseph Mugo Karaba and Pauline Mumbi Mugo who inherited the farm from Joseph's father, Kabumbu produced just 360kg of coffee this year. Rumble has exclusive access!
Small-scale, independent farmers like Joseph who process coffees themselves are in a position to directly control quality across every aspect of their production - from harvesting and picking, through to processing and drying. The resulting coffee reflects the incredible degree of hard work and attention to managing variables that Joseph so carefully pours into his work. The cherries for this lot were carefully handpicked by Joseph and his team, then sorted to ensure only the ripest were processed. Joseph has a small washing station on the farm, allowing him to fully process the coffee before it’s taken to the mill."
Producer - Joseph Mugo Karaba
Farm - Kabumbu Estate
Origin - Kirinyaga, Kenya
Altitude - 1500-1750 MASL
Roast date - 10/08/2026
Varieties - SL28, SL34, Batian
Process - Washed
Flavour notes - Sweet cocoa, Raspberry jam, Nectarine

Brew Guidelines
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Espresso - 9 bar Brew ratio - 1:2.2 (dry coffee : espresso liquid) Temp - 94 Deg C Time - 25-30 seconds. Grind - Start medium-coarse *Adjust grind size to achieve the desired time |
Espresso - 6 bar Brew ratio - 1:2.6 (dry coffee : espresso liquid) Temp - 94 Deg C Time - 25-30 seconds. Grind - Start medium-coarse *Adjust grind size to achieve the desired time |
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Pourover Temp - off the boil Ratio - 1:12 (dry coffee:water) Bloom - 30 seconds Flow rate - fast *Adjust grind size to achieve desired flow rate |
Aeropress Temp - off the boil Ratio - 1:12 (dry coffee : water) Bloom - 30 seconds Brew time - 90 seconds (including bloom) Press consistently over 15-20 seconds. |
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Stove top Ratio - 1-7 (dry coffee : water) |