Skip to content
The Keep
  • Coffee
  • Liberty
  • Capital

Theo Callahan

Coffee Senior Writer. Writes The Keep's Coffee coverage from the technique side — roast chemistry, brew variables, and product claims run side by side before they get believed. Curious, hands-on, allergic to received wisdom.

Coffee to Water Ratio: What a Scale Catches That a Scoop Misses

August 19, 2026August 19, 2026 by Theo Callahan

Home / Coffee / Coffee to Water Ratio: Scale vs. Scoop In this piece What a Scoop Actually Weighs Why That Range Beats the Pros’ Own Tolerance Where Weighing Stops Making a Difference Grab five different scoops sitting in five different bags of coffee — the free plastic one that shipped in the bag, a … Read more

Categories Coffee Tags Gear, How It Works

Tap, Filtered, Bottled, or Remineralized: What Your Water Actually Does to Your Coffee

August 24, 2026August 5, 2026 by Theo Callahan

Tap, filtered, bottled, and remineralized water all land on different points of the SCA’s mineral-content standard. Here’s the actual side-by-side, with real TDS numbers instead of guesswork.

Categories Coffee Tags Gear, How It Works

Dark Roast vs. Light Roast: Which Actually Has More Caffeine

August 24, 2026August 3, 2026 by Theo Callahan

The common belief is that dark roast hits harder because it tastes bolder. Tested by weight and by the scoop, the caffeine gap runs the other way — here’s the actual mechanism.

Categories Coffee Tags Gear, How It Works

Instant Coffee, Retested: How Close Has It Actually Gotten to Fresh-Ground

August 24, 2026August 3, 2026 by Theo Callahan

Freeze-drying, single-origin instant, and a blind test where instant beat drip. Here’s what’s actually changed in the cup — and what still hasn’t.

Categories Coffee Tags Gear, How It Works
About · Writers · Contact Us · Subscribe · Privacy Policy
© 2026 The Keep • Built with GeneratePress