Comment by eps
11 hours ago
A friend of mine went to a local mushroom picking course and among things they mentioned that morels are difficult to cook from fresh, because of the gastro problems. Apparently, the advice was to dry them before using in recipes.
What's up with that?
Superstition/caution.
They aren't 'difficult' to cook. They are dangerous to eat if uncooked (and thus undercooked).
While true morels themselves can be dangerous while uncooked, there are similar looking species that are both less and more dangerous.
Species of Gyromitra or "false morels" like Verpa Bohemica will commonly all be called "morels": both as an intentional cultural colloquialism or simple misidentification.
Depending on which hemisphere you live in, some Gyromitra species may be more dangerous than true morels. They can also be more dense and harder to cook thoroughly.
Most mushroom species will cause an upset stomach if undercooked. Drying is an effective way of reducing both dangerous and uncomfortable compounds. It's suggested for morels out of an abundance of caution, but it is not a necessary step.
(Note that not all compounds are destroyed! "Magic mushrooms" are famously traded dry for example!)
The advise to add an additional preparation step also increases the chance someone will notice the wrong species hiding in their ingredients. Undesirable species can have overlapping habitats and climates so its not uncommon for a careless or ignorant forager to pick the wrong thing.
> some Gyromitra species may be more dangerous than true morels.
People have died from eating them; they contain a powerful liver poison. Even claiming they are 'called "morels"' is ridiculous and irresponsible.
> Note that not all compounds are destroyed!
Mushrooms, like all matter, is made of "compounds". Dehydration is typically used to remove the dreaded dihydrogen monoxide!
Despite many people such as you and I yelling at random hippies and hillbillies online, they continue to call everything "morels". Reread my comment again: it is true that people colloquially misname dangerous species. I cannot help this. I can only point this fact out.
Morels contain several volatile compounds which cause gastric distress. (Forgive me for not looking it up at the moment, but one of them is/was a compenent of rocket fuel, which teenage me loved.) They have to be thoroughly cooked to burn those off. Or else dried.
Specifically for soup - which is, arguably, their best use - most people won't saute morels long enough before adding liquid, so it's always best to use dried for that. Otherwise, standard, boring, dry-sautéed + butter until tender works great, and has never given me a hint of upset.
The instructor of your friend's mushroom course may have been giving maximally-cautious advice, rather than trying to communicate nuance to the general public. That's often a wise choice. :-)
PS. If you're at all interested in foraging mushrooms, buy a copy of All the Rain Promises and More, by David Aurora. (If you're elsewhere than North America, buy a local guide, too, but still get ARPM.) Aside from the mushroom content it's wonderfully entertaining.
> Forgive me for not looking it up at the moment, but one of them is/was a compenent of rocket fuel, which teenage me loved.
It's hydrazine.
That advice makes no sense but it is way easier to cook with dried mushrooms. Maybe that's where the folk wisdom came from. When you us mushrooms your goal is to remove as much mushroom juice as possible and replace it with fats oils etc. When you start off dried it's easier
It does make sense; the poisons in morels (and many other "edible" mushrooms) are highly volatile. Heating them in a pan drives off the harmful compounds; heating them more gently in a large volume of liquid captures the compounds.
There's a variety of mushroom that has killed in the US, but is reportedly sold in Scandinavian markets. My theory is that Scandinavian recipes specify pan-frying or drying them first, and the unlike USian skipped this step.