Having been nerd-sniped again, I had to try this:

It turned out reasonably well:

That’s at 100 mm/s and 40% of a 60 W CO₂ laser. Although the exhaust fumes smelled pretty good, the bread tasted burned rather than toasted.
Undaunted, I tried another sandwich layer:

The patterns become more obvious in oblique light:

Settings, all with 0.3 mm line interval:
- Top: 100 mm/s @ 40%
- Middle left: 100 mm/s @ 20%
- Middle right: 200 mm/s @ 20%
- Bottom: 200 mm/s @ 12.5%
It’s good stinky provolone, so its taste remained undamaged by the experience.
Laser engraving apparently works really well on hot dogs and their buns, but I am not going there …
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