Fromage Blanc Without Rennet: A Twelve-Hour Lactic Set
A lactic set is the opposite of a rennet set. Nothing happens for eight hours, then everything happens at once. This record covers the culture rate, the two-stage drain that decides whether you get fromage blanc or something closer to yoghurt cheese, and the one fault that ruins it.
Each segment is as wide as its share of the 1440 minutes in the vat; the set segment carries the set temperature, the cut segment carries the cut size.
Salt and press drawer
Press ladder
Eaten within days; the surface is the cheese.
A light culture and a long, quiet set
Use 0.5% mesophilic culture by milk volume, about 5 g of a direct-set freeze-dried culture per litre, and no rennet at all. Hold at 22 C for twelve hours. The curd is ready when it pulls away from the wall of the pot when you tilt it and leaves a thin, glossy film.
Warming the vat to 30 C to speed it up is the most common mistake. Lactococcus at 30 C produces acid faster than the texture develops, and you get a curd that drains to a chalky paste instead of a smooth cream.
Drain in two stages, not one
Ladle the set into muslin and hang it for four hours at room temperature. Stir it once at the two-hour mark: the outer layer drains faster and will crust if you leave it. Then move the bag to the fridge for a further eight hours.
The warm stage develops the texture and the cold stage stops the acid. Skipping the cold stage gives the sharp, yeast-tinged flavour that people describe as sour milk rather than fresh cheese.
Reading the drain by weight
Four litres of 3.5% milk weigh about 4.1 kg and carry roughly 440 g of solids. For a spreadable fromage blanc, stop draining when the bag weighs 1.7 kg; for a firmer, spoonable version, take it to 1.4 kg. Weighing the bag is far more reproducible than watching for a drip rate.
Do not squeeze the bag to hurry it. Pressure at this stage forces fat out with the whey and the result is grainy rather than creamy.
Salt, and the shelf-life line
Stir in 0.6% fine salt and 2% cream by finished weight. Salt at this point is for flavour and for texture, not preservation; 0.6% is far too little to inhibit anything.
Keep it cold, in a covered container, for seven days. On day eight the surface yeasts take hold and you get a faintly fizzy, beery smell. That is not a fault you can fix by stirring it back in, and it is the reason this cheese is made in small batches rather than large ones.
Aging parameters
| Milk | Pasteurised cow milk 3.5% fat |
|---|---|
| Culture | Mesophilic 20–30 °C |
| Rennet | None (heat set) 0 IMCU/L |
| pH at drain | 4.5 target 6.1–6.5 |
| Target moisture | 72 % |
| Cave temperature | 5 °C |
| Cave humidity | 85 % |
| Aging days | 2 days |
| Rind treatment | No rind |
| Yield | 1.7 kg |
Pasteurised cow milk Fresh 2 days
Defect diagnosis
Flagged on this make: Rancidity
Bitterness not seen
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 seen this make
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 not seen
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
- 0.5% mesophilic culture, no rennet, 22 C for 12 hours
- Room-temperature drain for 4 h, then fridge for 8 h
- Stop at 1.7 kg for spreadable, 1.4 kg for spoonable
- 0.6% salt, 2% cream, eat within seven days