Double Mash Trouble

'''Double Mash Trouble - A MiniBrew Double Mash, it really tastes good. It contains a 'dangerous' amount of ABV. When you drink too much of this beer: you are in real trouble...'''

This was a test to see how a double mash on the MiniBrew would turn out. I made a combination of malts I had in stock while using some tips from the pros. It is quite interessting to notice that the ABV is lower than the brewery portal predicted. This could be caused by using roasted malts that lowers your pH. This has consequenses for your extraction during mashing and fermentation. The third time I brewed the Double Mash Trouble I noticed that the pH of the wort was 4.4, which is not ideal for yeast. I raised the pH using Sodium Carbonate. (I did some tests myself and calculated (I think) it required 0,43 grams).

Anyway the results are really nice. It is a tasty stout which is highly recommended by Richard and me.



System efficieny on single and double mash

Maybe you have noticed the brewing portal shows the system efficiency when you enter a recipe. When you mash using the maximum amount of malts (2300 grams) the ABV would be 6,7 and the efficiency a bit less than 55%. When you add an extra mashing stage and divide the 2300 grams in two, the ABV would be 8.8 and the efficiency a bit over 70%.





My experience on a double mash: when the wort flowed back into keg, I let the mash tun rest for an extra 50 minutes (after the software gave me the sign to remove the mash tun for the second run). During these 50 minutes extra wort dripped out of the malts on the bottom of the mash tun. Following this strategy, I collected 400 ml of extra wort (which would have been thrown away). In general, one might say: adding a mashing stage lowers the final amount of beer.

The recipe attached is my second double mash. I bottled my first double mash; 12 bottles came out of the keg (about 4 liter).