Ernst Kaffeeröster, Bonner Straße

A fine flat white, made with the house blend and served in a classic black cup at Ernst Kaffeeröster on Bonner Straße in Köln.When it comes to speciality coffee in Köln, Ernst Kaffeeröster is one of the city’s pioneers, having first opened in 2014 on Bonner Straße, in the new town south of the centre. In true German fashion, Ernst Kaffeeröster is both coffee shop and roaster, and you can still see the original roaster, a 5 kg Diedrich, behind the counter at Bonner Straße, although these days it’s only used to roast some of the single-origins. Instead, there’s a 20 kg roaster in a dedicated facility, which opened in 2016, while in April, a month before my visit, a second coffee shop was opened on Weyertal, near the university.

The original Ernst Kaffeeröster is a modest spot, offering a handful of tables inside, plus two more outside on the pavement, along with a solitary bench. The draw is the coffee, with a blend and single-origin on espresso, along with batch brew, AeroPress and Kalita Wave if you prefer filter coffee. The single-origin espresso changes every month, while for AeroPress and Kalita Wave, you can have any of Ernst Kaffeeröster’s filter coffees. There’s also tea, hot chocolate, various cold coffee options and, if you’re hungry, a selection of pastries, cakes, baguettes and granola.

You can read more of my thoughts after the gallery.

  • On Bonner Straße, in Köln's new town, south of the old centre, is Ernst Kaffeeröster.
  • Parked cars made getting a good photo a challenge. As well as the two tables in front...
  • ... of the window to the left of the door, there's also this bench to the right.
  • Stepping inside, the counter is at the back, with a retail shelf to the right.
  • The seating, meanwhile, is mostly to the left, where you'll find five three-person tables.
  • There's a solitary table in the middle of the room, with two more tables in the window to...
  • ... the left of the door, where a broad bench below the window provides some seating.
  • The seating continues along the left-hand wall, where two more tables line a narrow bench.
  • One of the tables in more detail.
  • Finally, tucked away behind the door to the right, is this solitary bench with built-in table.
  • Always nice to have your name on the wall in nice, big letters.
  • The shelves on the wall to the right of the counter...
  • ... hold the various blends and single-origins in these distinctive black bags.
  • To business. You order at the counter at the back...
  • ... where you'll find the till (effectively a tablet) and card reader in the middle.
  • The cakes, meanwhile, are displayed in this glass case on the right...
  • ... with more on top, including the baguettes.
  • On the other end of the counter, you'll find the espresso machine and its grinders...
  • ... while behind the counter is the original 5 kg Diedrich roaster, still in use today.
  • Unusually, the drinks menu is on the wall to the right of the roaster...
  • ... although there are also multi-part printed menus on all the tables.
  • The various espresso options are listed on the front page...
  • ... while after that comes filter coffee and tea...
  • ... followed by cold drinks...
  • ... hot chocolates and juices...
  • ... and finally, on the back page, cakes, pastries and breakfast options.
  • I started with a flat white, made with the house blend...
  • ... and possessing some awesome (and slightly out-of-focus) latte art...
  • ... which lasted all the way to the bottom of the cup.
  • I paired this with a slice of the banana bread, which was very fine indeed.
  • I went back to the counter to try the guest espresso, this Rwanda Nyamasheke...
  • ... served as a double shot in an oversized cup (which seems to be standard in German).
  • Before I left, I swapped Yirgacheffes, dropping off one I picked up from Elements in Maine.
Webpage Slideshow by v4.6

Ernst Kaffeeröster occupies a modest space on the western side of the busy Bonner Straße, a five-minute walk south of Chlodwigplatz, where multiple trams lines have stops. The façade is all glass, with a recessed door in the right-hand third, accessed via a couple of steps up from the pavement. If you want to sit outside, there are two thin tables in front of the window to the left of the door, each seating four on a pair of benches. These catch the morning sun, although a large canopy which extends from above the window provides some shade. Alternatively, a solitary two-person bench stands to the right of the door.

Inside, the layout is simple, with the counter at the back and the seating mostly arranged in the windows at the front or along the left-hand wall. To the right of the door, which opens to the right, is a narrow space, almost like a glass-walled box, where a single bench seat has its own, built-in table. Meanwhile, to the left are five three-person tables. Two line the broad bench which runs beneath the window, while two more are down the left-hand wall, which has a narrow bench running along it. Finally, in the middle of the space, to the left of the door, the fifth table stands in splendid isolation.

Ernst Kaffeeröster occupies the ground floor of an old building, which had two rooms, front and back. The seating is in the front  room, while the party wall has been knocked through, the counter now where the wall once stood. This is directly ahead of you as you enter, clear space between door and counter. There’s a set of retail shelves on the wall to the right, stocking Ernst Kaffeeröster’s full range of coffee in its distinctive black bags, a contrast to the coffee shop’s plain white décor.

The La Marzocco Linea espresso machine, with its twin Mythos grinders, is on the left, while the modest cake/pastry display is in a glass case on the right, leaving the centre free for a card reader and tablet, which acts as the till. Behind the counter, the original 5 kg Diedrich roaster takes pride of place, with a tall, multi-paned window at the back providing plenty of light, while an enclosed storeroom is off to the left.

Unusually, the coffee menu is on the wall to the right of the roaster, not the easiest to see from the counter, although there are multi-part menus on each table. Once you’ve ordered, take a seat and your coffee will be brought to you. As is often the case in German coffee shops, you only need pay when you leave.

I’d come for breakfast, starting off with a flat white, made with the house blend, resulting in a well-balanced, classic flat white with some beautifully steamed milk. I paired this with a slice of banana bread, which, in what seems to be the German way, was served cold and plain. That said, it was a very fine banana bread and delicious as it was.

I followed this up with the single-origin espresso, the Rwanda Nyamasheke, a washed Red Bourbon from the Mahembe washing station, produced by Justin Musabyimana. Based on tasting notes of plum, currant and tea with juicy citrus acidity, I was expecting something pretty funky, but it was surprisingly mellow, resulting in a very pleasant espresso.

I gave Ernst Kaffeeröster a parting gift, the Ethiopian Yirgacheffe that I’d picked up at Elements in Maine, receiving, in return, a bag of Ernst Kaffeeröster’s own Yirgacheffe. In turn, I passed this on to Neighbourhood Coffee in Liverpool when I returned home.

BONNER STRAßE 56 • 50677 KÖLN • GERMANY +49 (0) 221 1682 3207
Monday 08:00 – 18:00 Roaster Ernst KaffeeRöster (espresso + filter)
Tuesday 08:00 – 18:00 Seating Tables; Tables, Bench (outside)
Wednesday 08:00 – 18:00 Food Breakfast, Cake
Thursday 08:00 – 18:00 Service Order at Counter
Friday 08:00 – 18:00 Payment Cards + Cash
Saturday 10:00 – 18:00 Wifi Free
Sunday 10:00 – 18:00 Power Yes
Chain Local Visits 18th May 2022

You can see what The Coffee Vine made of Ernst Kaffeeröster from back in 2014, while if you’re interested in what the second coffee shop looks like (sadly I didn’t have time to visit) then The Coffee Vine has been there too!

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4 thoughts on “Ernst Kaffeeröster, Bonner Straße

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