Fermentation is the cheapest hobby that genuinely changes how you eat. A jar of sauerkraut takes ten minutes to make and a few weeks to ferment. The result is something you cannot buy in supermarkets at the same quality.
Where to start
Salt percentage matters most. 2% by weight (cabbage + brine) is the sauerkraut sweet spot — too little invites rot, too much kills the lacto bacteria. A kitchen scale is non-negotiable.
What matters most
Temperature decides the speed and the flavour. Room temperature ferments are bright and tangy; cellar-temperature ferments are deeper and slower. Both have their place.
What to skip
Trust the smell, not the look. White surface mould (kahm yeast) is harmless. Black or fuzzy mould is not. Yeast films can be skimmed off and the underlying ferment is fine.