Ledger / Semi-hard / 2026-09-09
Gouda: Replacing a Third of the Whey With Water
The curd wash is the whole idea behind Gouda. Draining off a third of the whey and replacing it with warm water lowers the lactose available to the culture, which means less acid at the end and a sweeter, rounder cheese. Get the temperature of the wash water wrong and you either stall the culture or cook the curd.
Each segment is as wide as its share of the 105 minutes in the vat; the set segment carries the set temperature, the cut segment carries the cut size.
Salt and press drawer
Press ladder
- 5 kg0.5 h
- 10 kg1.5 h
- 15 kg6 h
Applied at 4-8 weeks once the rind is dry. Stops weight loss and stops rind development, so wax late.
Cut, drain a third, wash with water at 36 C
0.5% mesophilic culture at 32 C, 24 IMCU of rennet per litre, thirty-five minute set, cut to 12 mm. Stir for ten minutes, then drain off exactly one third of the whey volume and replace it with water at 36 C.
The wash water must be within 2 C of the curd temperature. Cold water shocks the culture and the cheese ends up bland; hot water above 40 C tightens the curd and it never presses closed.
Stir thirty minutes and stop at pH 6.4
Stir for thirty minutes after the wash, then drain. The target pH at draining is 6.4, which is high, and that is the point: nearly all the sweetness of a young Gouda comes from stopping the acid early.
A 10-litre batch with 3 litres of whey replaced by water typically needs no more than twenty minutes of stirring after the wash. Test the pH, do not time it.
Brine at 20%, not dry salt
Press at 5 kg for thirty minutes, 10 kg for ninety minutes and 15 kg for six hours, then brine the wheel at 20% and 12 C for four hours per kilo. For a 4 kg wheel that is sixteen hours.
Brining gives a Gouda its characteristic thin, dry, even rind. Dry-salting a wheel this size produces a hard salty band on the faces and an under-salted centre, which is where the slit defects come from.
Wax at six weeks, eat at four months
Dry the wheel at 15 C for three days until the surface is bone dry to the touch, then age at 12 C and 85% RH. Turn daily for two weeks, then twice a week.
Wax at six weeks, once the rind is firm and dry and no longer tacky. Eat at four months for a young, sweet, slightly elastic Gouda; leave a waxed wheel at 10 C for twelve months for the firm, caramel-and-crystal version. Waxed wheels lose almost no weight, so the flavour concentrates much more slowly.
Aging parameters
| Milk | Pasteurised cow milk 3.5% fat |
|---|---|
| Culture | Mesophilic 20–30 °C |
| Rennet | Calf rennet (animal) 24 IMCU/L |
| pH at drain | 6.4 target 6.1–6.5 |
| Target moisture | 42 % |
| Cave temperature | 12 °C |
| Cave humidity | 85 % |
| Aging days | 120 days |
| Rind treatment | Wax |
| Yield | 4.1 kg |
Pasteurised cow milk Semi-hard 120 days
Defect diagnosis
Flagged on this make: Faulty eye formation、Bitterness
Bitterness seen this make
Signal — A harsh, lingering bitter note at the back of the palate, strongest in the first three weeks and often fading after six.
Cause — Too much rennet for the set time, or a microbial coagulant with high protease activity, or a scald that never got past 38 C.
Fix — Cut the dose by 20% next make and hold the scald 2 C higher for 10 minutes longer. Bitter peptides are water-soluble, so a 12% brine for 24 hours pulls some out.
Rancidity not seen
Signal — Soapy, paint-like smell that hits before the cheese reaches the mouth. Sharp and unpleasant rather than merely strong.
Cause — Free fatty acids released by lipase, usually from raw milk that sat warm too long, or from rennet paste, or from a knife or cloth that carried old milk residue.
Fix — Chill milk to 4 C within two hours of milking and pasteurise anything older than 24 hours. Retire the cloth: boil it, do not just rinse it.
Faulty eye formation seen this make
Signal — Either no eyes where the style demands them, or a scatter of irregular slits and cracks instead of round, evenly spaced holes.
Cause — Coliform or yeast contamination from unsanitary brine, or a press that was too cold (below 18 C) so the propionic culture never woke up, or too much salt killing it outright.
Fix — Boil and re-salt the brine to 18-20% between batches, press at 20-22 C for the first six hours, and keep the salt under 1.6% for eye-forming styles.
Misread surface mould not seen
Signal — A grey-green or black fuzzy patch on a rind that was supposed to be white or orange, or blue speckling on a hard cheese.
Cause — Wild Penicillium and Cladosporium from a cave with moving air and standing humidity. Also from brushing a good rind with a damp, dirty brush.
Fix — Distinguish before you discard: white felt and orange smear are wanted, green fuzz on a hard rind is surface only and rubs off with 3% brine. Black patches that pit the paste mean the wheel is lost.
Four things to carry forward
- Replace exactly one third of the whey with 36 C water
- Stop the stir at pH 6.4 - Gouda's sweetness comes from early acid arrest
- 20% brine at 12 C for four hours per kilo
- Dry three days, then wax at six weeks