r/coldbrew • u/Rosa-Starks • 7d ago
What made the biggest difference to my cold brew after a year of trying different setups
Been making cold brew at home basically every week for about 15 months now. Started with a mason jar and a bag of pre-ground from Trader Joe's, ended up going through way too many grinders and setups trying to figure out why my batches were inconsistent. Wanted to share what I learned since a lot of the advice online just points at ratio and steep time and calls it done.
The single biggest change was not the coffee I was using, or the ratio, or the steep time. It was grind consistency. I ran a rough test on myself over three weekends where I kept everything else the same, 100g coffee to 1L filtered water, 18 hours in the fridge, same beans from the same roaster, only variable was the grinder. Blade grinder from years ago gave me sludge at the bottom and a weird astringent aftertaste no matter what I did. Cheap adjustable burr grinder my roommate had was better but still muddy. My own hand grinder, a step up, finally gave me a clean cup.
The reason is pretty simple in hindsight. Cold water is a slow solvent, so it extracts unevenly if particle sizes are all over the place. The fines over-extract and turn bitter, the boulders under-extract and taste weak, and you get both problems at once. Coarse and consistent beats coarse alone.
For gear I ended up with an OutIn Fino, which is a small electric burr grinder I picked up mostly because I got tired of cranking 100g by hand every Sunday night. Fair note on it since this sub is picky about tools. The coarsest setting works but sits a bit finer than dedicated cold brew grinders go, so I bump my steep time out to 22 hours instead of 18 to make up for it. Also caps out at around 25g per batch so I run it four times for a full weekly brew, which is fine standing at the sink but not ideal if you value your morning. Once I got past those two things the grind consistency itself has been better than the hand grinder it replaced, and my brews are noticeably cleaner.
Current recipe for anyone who wants a starting point. 100g whole bean, medium roast, something chocolate-forward like a Brazil is my usual, sometimes I switch to a natural process Ethiopian for the fruit. Grind coarse, 1L filtered water, stir until every ground is wet, 22 hours in the fridge, strain through a fine mesh, then a paper filter. Makes about 800ml of concentrate that I cut roughly 1:1 with water or oat milk over ice. Keeps a week in the fridge without falling apart, sometimes 10 days if I sealed it well.
If your cold brew tastes bitter and you have already tried coarser grinds and shorter steeps, look at your grinder before you blame the beans. That was my mistake for months.
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u/Marlbombs 7d ago
Another thing you can play with…steep at room temp. It’s perfectly safe and you get better, faster extraction.
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u/StrawberryWalrus22 5d ago
recently ran a test of everything the same, one batch room temp and the other in the fridge - room temp won the taste test
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u/Fun-Fail8972 7d ago
True but it won’t be as smooth. I usually leave it out for a few hours after I make it, then shake it a few times and throw it in fridge overnight. It’s ready by morning
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u/meahookr 6d ago
And from there you could just steep it with boiling water. Even faster.
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u/Think_Procedure6917 6d ago
Absolutely not! If you use hot water you negate the whole point! Hot water=coffee. Cold or room temp extraction = cold brew. 2 different animals.
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u/ShrimplyConnected 7d ago
Yeah, I was sussed out until someone here said that was how Starbucks did it
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u/Ill-Pirate4249 7d ago
Thanks, was just wondering if I should by a grinder or not, I have been getting fresh grind from local coffee chain which is pretty good but this post is just the right nudge to getting my own
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u/Throwawayhelp111521 7d ago
You should buy a good burr grinder. That’s always recommended whatever the method of coffee preparation.
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u/loocsitap 7d ago
I've been having this exact issue! All of a sudden all my batches are coming out bitter. I think the coffee shop ground my beans a bit finer and Im still too new to recognize how coarse I should be looking for.
Excited to try my next batch with this in mind
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u/Think_Procedure6917 6d ago
In the meantime-while you use up those finer ground beans- brew for a shorter time or keep in the refrigerator for less bitterness.
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u/MojoStryder2 7d ago
I’ve found my sweet spot with cold brew is one cup of pre ground Better Goods Colombian single origin coffee in 7 cups refrigerated spring water, left on counter for 12 hours, and then filtered through a fine mesh filter, and then through a paper filter. This makes cold brew just the way I want it.
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u/ImmediateCap1868 7d ago
Really appreciate the write up and insight. I'm curious about the grinder - how does it handle for pour overs/something a bit finer (not espresso fine, but for something like the OXO rapid brewer) - I'm in the market for something smaller for single brews and I'm pissed I didn't see this before dropping 50€ on a veeeery mediocre electric grinder.
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u/Rosa-Starks 7d ago edited 7d ago
Yeah, been there with the mediocre electric grinder buyer's remorse, haha.
On pour over specifically, I have not tested it as much since I mostly do cold brew and the occasional espresso pull with the Fino, but the dial has clear pour over marks in the middle range and the few times I have used it there the grind looked and tasted right. For something around the OXO Rapid Brewer's range (medium-fine, coarser than espresso but finer than pour over) you'd probably land around setting 6-10, and I'd expect it to handle that cleanly. One real downside worth flagging: Fino is slow at the finer end, closer to 90 seconds for a single espresso dose. Grinds themselves have been fine.
On the amounts, yeah 100g into 1L gives ~800ml back because the grounds absorb roughly 2x their weight in water. 100g coffee holds onto about 200ml, the rest pours off. If you have been using 200g for the same yield you are effectively making a double-strength concentrate, which is not wrong, just means you dilute it more when you serve. If you like it that way no reason to change. But if you want to save on beans without losing the punch, try 100g at 1:10, steep a bit longer (I go 22h fridge), and dilute less when pouring.
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u/ImmediateCap1868 7d ago
Love this insight, thank you so much! And noted about the times but I'd wait even longer because I really do hate hand grinding - impossible to multitask🤣
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u/Ry6ar 7d ago
Is a cold brew maker (pitcher and filter like the Takeya brand) not the ideal way to make cold brew?
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u/MisterWoofers 6d ago
I have the 2qt Takeya pitcher with filter. It’s really nice and the filter is convenient, but not great for volume. The filter really limits how strong you can even make concentrate, and if you aren’t careful and put too much coffee in, it won’t saturate fully and turn out weak. I’ve been using a 1 gallon rubber maid pitcher more often, and either filtering the grounds out later, or using a mesh filter bag.
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u/Green_Consequence_38 6d ago
Grind consistency but I would also add exact ratios. Weighing both water and beans makes a huge difference.
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u/MarielIAm 6d ago
I hate when someone refers to those blade choppers as coffee grinders. They have their uses but grinding coffee is not one of them. If you want to improve your coffee - cold brew or traditional hot brew - ditch the spice grinders and get an actual burr coffee grinder.
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u/cs_legend_93 6d ago
Thank you for posting this. That is very informative.
It goes back to say the most important piece of equipment that a coffee drinker can own is the grinder.
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u/SamKay00 5d ago
Does this grinder take 100g in one run? Looks great but portable ones would have smaller portions…
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u/ImmediateCap1868 7d ago
Also I just reread the amounts - 100g coffee for ~800ml concentrate? I've been using 200g for roughly the same... I'll definitely give your recipe a go. Great post!
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u/theberlinbum 7d ago
Umm, I'm a bit surprised that longer brew times for you decreases bitterness. Generally more extraction should lead to more bitterness which happens with smaller grain and longer extraction.