I've read lots of reviews and the taste profile looks very good to me. ...
I think you've probably seen my
"Victorian Bitter" thread. The key post being a review of the results it brings:
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Flavour of Chevallier malt: This is not hairy fairy, difficult to appreciate, bit more "biscuity" or "grainy" than another malt, it's in-your-face, right gob full differences; weighty, creamy, sweetish differences you'd notice even if your tongue were cut out. It wont please the raspberry, mocha, cherrypie "porter" brigade, but others might be convinced as to why they bother with that "Maris Otter" muck (though I would miss the thinner, fizzy, colder offerings when surrounding temperature gets above 25°C). This is very malt forward, the stacks of EKG hops have had enough time to moderate and very much take the backseat. …
The first example was a "SMASH" (Chavallier barley and EKG), a clone of a Morrel's beer from 1889. The recipe was inspired by Edd Mather's work exploring old beer records, but unfortunately he's chosen to remove Web access to his work so many links in that thread won't now work.
My experiences are quite out of step with some of the reviews above, possibly because of the techniques I use; high-ish temperature mashes and dextrin adverse yeasts (like S-33 and WY-1099). I think "modern", so-called "craft brewing" techniques might result in less obvious results as recorded in the above posts (to produce the "thinner, fizzer, colder offerings" I mention).
I'm still very much a fan of Chavallier barley malt, using the stuff now almost exclusively as my preferred base malt. Even for historical clones that pre-date the discovery of Chavallier barley malt because it responds to treatments when mashing that I expect would have been normal for malts back in that time.
It does need to be handled carefully. Fast, high temperature mashes can go badly wrong! A porter I made a few months back was mashed for only 45 minutes (instead of the planned 75) at 67°C and fermented with S-33. The aim was to get a FG about 1.018 but I ended up with 1.027. It took a week for some S-04 yeast to establish itself and it then got it down to 1.012 (not what I wanted!).
Recent brews gave 75 minutes at 66°C and the first (stout) has a FG of about 1.020-22 (not confirmed yet). Using WY-1099 yeast. The second (pre-black malt Porter from 1804) is heading for a FG of high teens. Both grists contain base malts other than from Chavallier barley.
I tend to raise the mash temperature to 69°C for 30-40 minutes, "Hochkurz"-like. I've not found lower extraction rates from this malt, but the "beta-amylase" enzyme (primary maltose producer and preferring lower mash temperatures) seems to be what requires careful treatment (extended low temperature mashes). But if not using a "dextrin adverse" yeast you may not notice the potential for higher FGs.
Dextrin may not be the sole reason for the malt's "weighty" mouthfeel, but I haven't figured what else but dextrin it's contributing.