Would you mind posting your recipe?
It is simply Herman Holtrop's Rochefort clone recipe...(google that)I made 10 gallons of it.
to which I added one half pound of mahleb. EDIT: NOT in the boil but in the cask=secondary.
The mahleb was bought whole and I put the cherry pit hearts through the grain mill and then
wet it good with everclear to keep it sanitized...added that to the cask.
Next I added the canned cherries and 2 packs of WY Bret Lambicus and the dregs from
several bottles of Avery Depuceleuse (limited bbl release can't help you with that one).
That's it....(you could lower the mahleb to 1/4 pound and still be ok...that stuff is strong)
Method is kind of weird with the Oak cask...first I put the beer in that new oak bbl for a month...then
I pulled 5 gallons of that out and carbed it up...that pull made the room for the above additions....so I suppose
you could get similar results with carboy or corny ageing with oak cubes. Just brew 5 gal. of the base beer,
add 1/8 pound of the mahleb and one pack of bret and 2.5 gal of canned cherries...that will be very close I'd imagine.