Brewed Sunday 6 Sept 2026 for Oct Ed session.
Hop 'tea' with 2 litres of wort while mash is in oven (over -bittered? We shall see).
Mash in 8:45 Sun 6 Sept 2026.
Heated both mash wort and sparge water to 75C to pasteurise.
Into fermenter 12:30pm @35C, 13 brix=1.050, 14.355kg=13.67
litres. Pitched 2022 kviek pack dry.
8:30am Monday (20 hours) 6 brix=1.005. *pm Monday 5.5 brix=1.003.

Keptinis: Method Notes for a Home-Scale Attempt

Synthesized from Lars Marius Garshol's firsthand account of the Jančys family brew (Vikonys, 2017) and his own documented home-kitchen attempts, plus Jeff Alworth's overview of the kaimiškas tradition. Nobody has fully solved home-scale keptinis — this is a "best available knowledge" method, not a guaranteed recipe. Expect to iterate.

The core challenge, up front

True keptinis flavor comes from actual caramelization of the mash's sugars, which requires the mash surface to reach roughly 160–180°C (320–356°F). Below that threshold you get Maillard browning — real flavor, but shallower and different in character. The documented obstacle: a mash is full of water, and water caps a wet surface at or near 100°C (212°F) until it's mostly driven off. Garshol's own attempts at 180–250°C for 2–3 hours never got the center of the mash above ~100–102°C — only the surface and edges reached true caramelization temperatures. Plan around this rather than expecting an even, fully caramelized loaf.

1. Grist

Neither source article gives exact quantities, so this section leans on published homebrew attempts rather than the traditional accounts alone.

• Base malt stays close to 100% pale. Tradition is unambiguous here, and a Craft Beer & Brewing recipe built on Garshol's own trials uses 14 lb (6.4 kg) pale malt with nothing else. All the color and flavor is supposed to come from the bake, not the grain bill — resist the urge to add crystal or roasted malt.
  
• Real homebrewers hedge slightly, adding small amounts of oat and rye/wheat malt for body and head retention — genuinely useful here since this is an unboiled, lightly hopped, often bone-dry style. Two published all-grain recipes (Brewer's Friend) land on roughly:
  
  • 5 kg extra pale malt + 0.4 kg oat malt + 0.2 kg rye malt (21 L batch, OG 1.063, FG 1.016, 6.2% ABV), or
    
  • 5 kg Pilsner malt + 0.4 kg golden oat malt + 0.25 kg rye + 0.5 kg golden ale malt + 0.25 kg wheat malt (21 L batch, OG 1.060, FG 1.014, 6.1% ABV, ~31 IBU).
    
• Working ratio: roughly 80–90% pale/Pilsner malt, with 5–10% combined oat and rye/wheat malt for mouthfeel and a little spice-like complexity.
  
• Worked example for a ~20 L (5 US gal) batch:
  
  • 5.0 kg Pilsner or pale malt
    
  • 0.4 kg oat malt
    
  • 0.3 kg rye or wheat malt
    
  • ≈ 5.7 kg total — lands in the same OG neighborhood as both published recipes (roughly 1.058–1.063), assuming similar efficiency.
    
• Efficiency is the real wildcard. Published attempts range from 66% to 75% brewhouse efficiency — nobody's nailed down a reliable number for this process, since baking behaves nothing like a normal mash/lauter. Plan for something in the 60–70% range, and check your actual pre-boil-equivalent (post-lauter) gravity on brew day rather than trusting a calculator's estimate.
  
• Untested variant worth knowing about: in his blog's comments, Garshol was asked about substituting Munich malt for pale malt to add a bready base note under the caramelization. He hadn't tried it himself — treat it as an interesting experiment, not established practice.
  
  

  2. Mash
  

  
  

• Conventional infusion mash, thick consistency (less water than a normal mash — you're aiming for a moist dough, not a soupy mash).
  
• Mash temperature: ~65°C (149°F), about an hour. This matches both the traditional method and Garshol's own practice.
  
  

  3. Prepare for baking
  

  
  

• Transfer the mash into a shallow, wide metal tray or pan rather than a deep one. More exposed surface area = proportionally more crust relative to volume — this is the single most impactful adjustment for a home oven.
  
• If you have multiple shallow trays, splitting the mash across them (rather than one deep container) will likely outperform one large batch.
  
• Traditionally the mash was shaped into loaves (sometimes bound with straw) and baked with no container at all — the metal trays are a modern convenience, not a requirement of the style.
  
  

  4. Bake
  

  
  

• Preheat your oven as hot as it will safely go — 250°C (480°F) or higher if your oven allows it.
  
• Use a pizza stone, quarry tiles, or a pizza steel under the tray. These transfer heat into the tray's underside far faster than bare oven racks, which is closer to how a brick duonkepis actually works.
  
• Turn on your oven's convection/fan function if it has one — this helps drive off surface moisture and encourages true browning rather than steaming.
  
• Bake time: plan for roughly 2 hours, but watch the surface directly rather than trusting the clock. Stop when the surface has developed a deep brown-to-black crust. One published Lithuanian recipe instead runs a lower, more controlled 190°C with the fan on for a full 4 hours — a reasonable alternative if you'd rather trade peak heat for a longer, gentler bake.
  
• Do not expect the center of the mash to caramelize — based on documented attempts, it likely won't get past ~100°C. This is normal, not a failure.
  
  

  5. Break up and re-mash
  

  
  

• Once cooled enough to handle, break up the baked mass with a sturdy spoon or spatula — expect a hard, sugar-crusted top layer over softer material below.
  
• Add hot water and re-mash/steep as you would a normal mash, to redissolve the fermentable and caramelized material.
  
• Lauter as normal. Historically, straw was used as a lautering filter bed — a mesh bag or your normal lauter setup works fine as a substitute. Expect a very dark wort even though you started with 100% pale malt.
  
  

  6. Hops — as a tea, not a boil
  

  
  

• The wort itself is not boiled at any point.
  
• Boil your hops separately in a small amount of water to make a hop tea, then add that tea to the wort (either pre-fermentation or post-fermentation and blended to taste — pre-fermentation is the more common approach).
  
• Garshol's own estimate of the Jančys family's traditional beer is around 50 IBU — needed to balance the intense caramel sweetness. Published homebrew clones land noticeably lower in practice, around 20–31 IBU, and still read as balanced. Treat 25–50 IBU as the reasonable range and pick based on how sweet your bake turns out.
  
• European noble-type hop varieties (Saaz and similar) show up in both traditional accounts and published clones, but bittering character matters more here than a specific varietal signature, since the beer won't showcase hop aroma the way a boiled, late-hopped beer would.
  
  

  7. Ferment
  

  
  

• No boil means pitching directly onto cooled wort — sanitation discipline matters more here than in a normal process, since there's no boil to sterilize the wort.
  
• Yeast is flexible and not strongly standardized in the tradition: commercial ale yeast, baker's yeast, and family/house yeast cultures have all been used historically and by modern brewers. A clean commercial ale strain is a reasonable, low-risk default for a first attempt.
  
• Expect a low finishing gravity — traditional keptinis can finish under 1.004 despite tasting quite sweet, so don't be alarmed by a dry hydrometer reading; the caramel character carries the perceived sweetness independent of actual residual sugar.
  
  

  8. Packaging expectations
  

  
  

• Traditionally poured soft and nearly still — closer to cask conditioning than typical carbonation levels. If kegging or bottling, consider a lower carbonation target than you'd use for a standard ale; the style's balance depends on a soft, non-fizzy presentation.
  
  

  What to log on brew day (for the deck's "This Batch" slide)
  

  
  

• Grain bill (malts and quantities) and measured/estimated mash efficiency
  
• Oven setup (make/model, stone/steel used, fan on or off)
  
• Bake temperature (set point) and total bake time
  
• Surface appearance at the point you stopped baking
  
• Original gravity → final gravity, and calculated apparent attenuation
  
• Estimated color (EBC/SRM) if you can measure or estimate it
  
• Hop variety, quantity, and estimated IBU from the tea
  
• Yeast used
  
• Any deviations from this method, and why
  
  

  Realistic expectations for a first attempt
  

  
  Based on every documented home attempt so far: you will very likely get a browned-to-black surface with a pale, less-caramelized center, and a beer with genuine caramel, toast, or mineral character — just less depth than the Jančys family's brick-oven result. That's the expected outcome, not a sign you did it wrong. The style is described as very forgiving: it's difficult to ruin outright, even though it's difficult to fully nail on the first try.