How to Prepare Your CoffeeKafi Luz
Ratio breakdown
Ingredients run from the top of the cup to the bottom; the last item is the bottom layer. Values are normalized to a true 100% stack.
Kafi Luz is Central Switzerland's own way of lacing an afternoon coffee — named for Luzern, the canton where it's centred, and known elsewhere in the country as Kafi Fertig or Träschkaffee. The rule that defines it isn't a measurement so much as a test: brew the coffee thin enough that you could read a newspaper through the glass, because Träsch, the region's own clear apple-and-pear schnapps, is what's meant to carry the cup, not the coffee. Sugar cubes go into the glass first, weak coffee follows until they vanish from sight, and the schnapps is poured back in until they reappear — a small tug-of-war between visible and invisible that turns the pour itself into the ritual. Lucerne's own distilleries still bottle Träsch expressly for it, and the drink is a fixture of the region's Fasnacht carnival season, warming hands between parade stops.
What you need
- 45 ml (about 1½ shots) Träsch — Lucerne's apple-and-pear brandy, or a similar clear fruit schnapps such as kirschSchnapps
- 2 sugar cubesSugar
- 90 ml weak, freshly brewed black coffee — a thin filter or long black, not a full-strength cupCoffee
Method notes
- Grind
- Medium — a normal filter grind, brewed weaker than you'd usually pour
- Water temperature
- Hot coffee, poured over a room-temperature schnapps measure
- Total time
- 5 min
Steps
Set two sugar cubes in a clear glass
The cubes double as the drink's own strength gauge — watching them appear and disappear through the liquid as you pour is how a proper Kafi Luz gets measured out at home, without scales or jiggers.
Pour in the weak coffee until the cubes vanish from sight
The coffee is brewed thin on purpose — a full-strength cup would hide the cubes (and the schnapps that follows) long before the glass is right, so a thin filter or long black is the traditional base, not a mistake to correct.
Add the Träsch back in until the cubes reappear
This is the drink's built-in test: schnapps goes back in exactly until the glass is light enough to see the sugar again, the same point the old saying about reading a newspaper through it describes.
Stir once and drink it warm
A quick stir dissolves the last of the sugar and folds the schnapps evenly through the cup — Kafi Luz isn't layered or sealed under cream the way Irish coffee or the German Pharisäer are, so there's no cap to protect.
Tips
- Träsch — Lucerne's own clear pear-and-apple schnapps — is the traditional pour; kirsch or another light fruit brandy is the accepted stand-in outside the canton.
- Kafi Luz is a Fasnacht (carnival) tradition in Lucerne — a warm-you-up drink passed hand to hand between parade stops, not an after-dinner digestif.
- Serve it in a clear glass rather than an opaque mug — the whole point of the tradition is watching the sugar cubes disappear and reappear as you pour.
Common mistakes
- Brewing the coffee full-strength — a dark, opaque cup hides the schnapps and fails the tradition's own 'read a newspaper through it' test.
- Using a neutral spirit instead of a fruit schnapps — vodka or a generic spirit skips the apple-and-pear character Träsch is chosen for.
FAQ
Why is it called Kafi Luz?
'Luz' is short for Luzern — Lucerne — the canton at the centre of the tradition. Move to a different corner of German-speaking Switzerland and the same drink goes by Kafi Fertig ('coffee, done') or Träschkaffee, named directly for the apple-and-pear schnapps, Träsch, that defines it.
Why does the coffee need to be so weak?
Because Träsch, not the coffee, is meant to be tasted. The quality test repeated by nearly every source describing the drink is that a proper Kafi Luz should be light enough to read a newspaper through the glass — a dark, full-strength cup would drown the schnapps out and miss the point of the ritual.
How old is the tradition?
Sources disagree on the specifics. Lucerne Tourism dates the name itself to 1918, when DIWISA — a Lucerne-region distillery still producing Träsch today — began making the schnapps the drink is named for. A separate, more folkloric account ties the broader habit of lacing coffee with schnapps to an earlier 18th-century clampdown on home distilling, when farmers are said to have started hiding their spirits inside a coffee cup. Both stories circulate locally; neither is independently verified beyond the tellers themselves.
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