Sunday morning. I sit down to make filter coffee. I have a drip machine, a freshly opened bag of Starbucks Ethiopia Medium Roast, a burr grinder. Nothing should go wrong, right.
It went wrong.
Everyone online says 1:16. 25 grams of coffee for 400 ml of water. I made it, could not drink it. There was a bitterness on my palate that I could only describe as "like tar."
I opened the tap. 1:17, 1:18, 1:19. Same thing. Eventually I pushed it to 1:28. Twenty-eight parts water to one part coffee. Basically tea consistency. Only at that ratio did it taste normal.
But hold on. 1:28 is not a real ratio. Standard is 1:16. I was watering this coffee down to drink it. Ethiopian coffee with jasmine, bergamot, lemon notes, and I was drowning it. Something was wrong.
I am an engineer. I sat down to look at this systematically. Eliminate them one by one.
Ratio? I pushed it to 1:28. That was not the issue.
Grind? I was using a blade grinder before. I looked at the output: dust, big chunks, even half-broken beans. Total chaos. Dust over-extracts and turns bitter, big pieces under-extract and stay watery. Switched to a burr grinder, ground at sea salt coarseness. Got better but the bitterness did not go away.
Water temperature? Drip machines push water at 96 to 100 degrees. Ideal is 92 to 94. I pre-rinsed the filter with hot water and tried again. Still bitter.
Machine? Tried bypass. Brewed concentrated with less water, then added hot water on top. Still bitter.
After elimination, only one suspect was left. The bean.
Baristas have a test called cupping. The logic is simple: hold every variable constant, let the coffee speak.
I took 10 grams of coffee, put it in a cup. Boiled water, let it rest 2 to 3 minutes, around 80 to 85 degrees. Poured 170 ml, stirred, waited 4 minutes. Skimmed the crust off the top and tasted. I had cleaned my palate beforehand with water and a cracker.
Still bitter, man. Chocolate, burn, tar.
There is the answer. In a cupping test there is no over-extraction, the temperature is low, contact time is short, no pressure. If the bitterness still shows up here, the equipment is not guilty. The bean is.
Starbucks is famous for over-roasting worldwide. The label says "Medium Roast" but it is really medium-dark, even bordering on dark. The bags shipped to the European market are especially dark. By now I am sure: these guys get their beans from a crematorium. There is no other explanation.
Roasting a delicate bean like Ethiopian this dark is wrong. Yirgacheffe's jasmine, Sidamo's bergamot, Guji's lemon and honey, all of it burns to ash during the roast. What is left is just carbon bitterness. They burn the soul of Ethiopia, then package it and sell it as "Medium Roast."
So from the moment I opened the bag, the result was set. Whichever machine I used, whichever ratio I tried, it would not have made a difference. Good filter coffee starts with good beans. Everything else is detail.
Same day, I stopped by Romesta in Yaşamkent. I told them the situation, "for filter, balanced, not too acidic." They handed me Colombia Keramo, fresh roast, 250 grams.
Came home. Same drip machine, same burr grinder, same sea salt coarseness, brewed at 1:16.
The coffee was incredible. Sweet, balanced, hazelnut and chocolate, soft caramel. No bitterness, no tar, nothing. Easy on the palate, makes you want another sip.
Same equipment. Same ratio. Same water. Only the bean changed. That clear of a difference.
Brand is not a guarantee of quality. Starbucks is a huge company but they cannot honor Ethiopia's name. They torch it.
Equipment matters but the bean decides. Burr grinder, right ratio, right temperature, none of that saves a badly roasted bean. You cannot make a meal out of garbage.
Filter coffee needs light to medium roast. Do not read the label, read the roast date, read the roaster. A serious roastery distributes coffee within 2 to 3 weeks. They do not burn delicate beans with dark roasts.
Buy from local roasters. Places like Romesta do real work. They give you fresh beans, they know how to roast them, they walk you through it. Drop the supermarket-bag habit.
Systematic testing solves every problem. Eliminate variables one by one, form a hypothesis, verify it. Works for coffee. Works for everything.
The Starbucks bag stays for milky sugary drinks, maybe I will make a latte with it. As filter, I am done chasing it. I am not paying that brand for filter coffee again.
Romesta is a fixed stop now. When the Keramo runs out I will try a washed Ethiopian Yirgacheffe. I want to see what the bean Starbucks burns actually tastes like.
The moral of the story: good coffee starts with good beans, the rest is decoration.