#39 Here is Gose, First Kettle Sour

Steps

Take yeast out of fridge 3 hours before pitching.

Bring the wort to 140 degrees, add 5g salt and 1g coriander, and then turn the heat off (heat for 5-15 minutes).

Transfer a portion of the wort to a starter flask.
Pitch WLP644 Trois when temp is at 70°.

Leave remaining wort in kettle.
Adjust PH ~4.2 to limit growth Clostridium butyricum and other potential off-flavor bacteria. Add 2 ml of lactic acid.
Chill the wort down to 95°.
Add 5 oz of Goodbelly Mango drink.
Cover with blankets.
Allow it to sour for 24 hours. No external heating is required.
Target PH: 3.6 - 3.8

After the souring phase, heat to kill the Lactobacillus before adding the WLP644 Trois for 5-15 minutes at 140 degrees.
Chill the Lactobacillus wort down to ~70°F and pitch WLP644 Trois.

After 2 weeks a stable gravity should be reached.
Rack or transfer off as normal to bottles or a keg.

Goodbelly: 8oz per 5 gallons = 1.6oz per gallon X 3 gallons = 4.8 oz (5 oz)
Salt: 0.5oz per gallon - 0.0625 per gallon X 3 gallons = 0.1875oz (5.315g)
Corriander: 1oz per gallon = 0.125 per gallon X 3 gallons = 0.375 (10g) - cut by 50% to 5g
Lactic acid: Using 1 mL of 88% lactic acid per .1 shift in pH for 5 gallons of wort is a good starting measurement. As an example, say that 5 gallons of wort has a pH of 5.0 just before pitching the Lactobacillus culture. Begin by adding 5 mL (1 US teaspoon) of food grade lactic acid to the wort for a target of ~4.4 pH.