Embrace the Sour Side

Mash and Sparge: Use a simple single infusion mash. The wheat malt will provide plenty of body even though this is a low-OG beer. If you are an extract brewer, you can make the calculations for the jump to light speed and skip ahead.

Boil the Wort: Boil for 15 minutes, but wait to add hops. Hops inhibit Lactobacillus, which we need for souring.

Lower the pH: It's a good idea to lower the wort pH to 4.5. The lower pH helps prevent other bacteria or wild yeast from ruining the batch. You can use lactic acid, phosphoric acid, or even acid malt. 10ml of Lactic acid will get you there. Since we are after a lactic profile, it makes sense.

Fermentation Stage One: Cool the wort and start fermentation with Lactobacillus only. Keep it warm, around 112-115°F (44-46°C). You could use an electric blanket or FermWrap heater to maintain the temperature. Using one of the many electric mash kettle options, you can program the unit to hold that temperature, depending on your model.

Monitor pH: Check the pH every 12 hours. When it reaches 3.6-3.8, it's ready for the next stage.

Boil Again and Hop: Boil the wort again, this time for 60, and add a small amount of hops. Boiling kills the Lactobacillus and stops further souring. 10 IBU’s is a good start. Since hops will no longer impact lactic acid formation, who am I to judge if you want a hoppy sour?

Fermentation Stage Two: Aerate the beer and add your conventional ale yeast. Let it ferment out, then bottle or keg as usual.