I left this outside overnight. Then for a while to ferment. No drop in gravity, but souring took place.
Pitched Mangrove Jacks Yeast to ferment it out. Checked FG a month later and was at 1.022 - probably acid / complex sugars unable to ferment with this conventional yeast.
Water: https://www.brewersfriend.com/mash-chemistry-and-brewing-water-calculator/?id=8KVWXYS
This is one to age for a while...
Turbid Mash:
Dough in to 45C (0.7L/Kg) 0.88 L @ 61C
Rest for 10 Mins at 45C
Add boiling water to reach 56-59C (Try 145ml for ~1L/Kg ratio)
5 min short rest
Pull first turbid portion 225ml (4-5% of target brew volume)
Heat this portion to at least 82C
Main mash rests a bit longer at 56C - 5 mins
Add more boiling water to reach 66c (as much a is needed to reach temp) - this is the main step, so rest 20 mins
Stir often
Second turbid portion pulled - 1 Litre - about 24% of target brew volume.
Add more boiling water to raise temp to 72C (Enough to reach temp) - Rest for 20 mins
Drain about 1.25 Litres of wort to pan or jug.
Add turbid wort back to mash, this should raise temp to 75C.
Hold for 10 minutes.
Heat sparge water to 88C and sparge brew bag as normal by dipping.
{"RecipeId":66786,"RecipeTypeId":10,"OriginalRecipeId":null,"UnitType":"m","IbuFormula":"t","CreatedBy":103318,"Name":"Spontaneously Fermented Turbid Mash","Description":"I left this outside overnight. Then for a while to ferment. No drop in gravity, but souring took place.\n\nPitched Mangrove Jacks Yeast to ferment it out. Checked FG a month later and was at 1.022 - probably acid / complex sugars unable to ferment with this conventional yeast.\n\n\n\n\n\nWater: https://www.brewersfriend.com/mash-chemistry-and-brewing-water-calculator/?id=8KVWXYS\n\nThis is one to age for a while...\n\nTurbid Mash: \nDough in to 45C (0.7L/Kg) 0.88 L @ 61C\nRest for 10 Mins at 45C\nAdd boiling water to reach 56-59C (Try 145ml for ~1L/Kg ratio)\n5 min short rest\nPull first turbid portion 225ml (4-5% of target brew volume)\nHeat this portion to at least 82C\nMain mash rests a bit longer at 56C - 5 mins\nAdd more boiling water to reach 66c (as much a is needed to reach temp) - this is the main step, so rest 20 mins\nStir often\nSecond turbid portion pulled - 1 Litre - about 24% of target brew volume.\nAdd more boiling water to raise temp to 72C (Enough to reach temp) - Rest for 20 mins\nDrain about 1.25 Litres of wort to pan or jug.\nAdd turbid wort back to mash, this should raise temp to 75C.\nHold for 10 minutes.\nHeat sparge water to 88C and sparge brew bag as normal by dipping.\n\n\n\n","ImageUrlRoot":null,"StyleId":null,"StyleName":null,"BatchSize":4.5,"BoilSize":8,"BoilTime":60,"Efficiency":0.69,"DateCreated":"\/Date(1552660437513)\/","BrewSessionCount":0,"MostRecentBrewSession":null,"Og":1.0659002140019886,"Fg":1.0217470706206562,"Srm":3.3570790711324752,"Ibu":0,"BgGu":0,"Abv":5.6957554961918744,"Calories":226,"AverageRating":0,"TastingNoteCount":0,"Fermentables":[{"Per":"73","Amt":"1","Ppg":"38","L":"1","Use":"Mash","Id":"355236","IngId":"575","Name":"Pilsner - DE","CustomName":"","Rank":"1"},{"Per":"27","Amt":"0.375","Ppg":"36","L":"2","Use":"Mash","Id":"355237","IngId":"586","Name":"Torrified Wheat - US","CustomName":"","Rank":"2"}],"Hops":[],"Yeasts":[{"Atten":"0.67","Id":"104516","IngId":"1007","Name":"Mangrove Jack M44 West Coast","CustomName":"","Rank":"1"}],"Others":[],"MashSteps":[],"Steps":[]}