Low oxygen Roach Four amber trappist enkel: preboil, smb and btb, mash cap, nosparge. Spunding in keg failed partially because of leak. Result: more than good enough to continue using this method. Maybe amount of esters could be better. The monks of Westmalle use shallow fermentation vessels to minimize the amount of CO2 in the fermenting beer, because apparently CO2 inhibits the formation of esters.