I hadn't realized such a thing existed, canned puffball mushrooms in brine. Intrigued, I bought a can, brought it home and placed it in the cupboard with the dozen or so other cans of mushrooms from oriental food markets.
Eventually they were used in a soup I made one Saturday afternoon. I called the soup "Faux Pho", a whatever was in the refrigerator and garden version of the super yummy Vietnamese soup.
The ingredients looked good, but as soon as I opened the can of puffballs I was suspicious. Brownish-grey, glistening, oddly firm. I cut one open and my suspicions deepened; when cut a black goo exuded from the interior. But I was determined to try one, I'm generally a big fan of foods in brine and all things pickled.
But one bite proved that they were even worse than expected. The puffballs were way too similar to peas, my mortal food enemy. But I persevered, and tried a few in the soup. Still disgusting, just like peas; biting through the skin produced a queasy pop and then filled the mouth with not-quite-tasteless paste.
Otherwise the soup was great and a big hit with the rest of my family. I started to think about the puffballs in brine, and wondered if they were really edible; not everything in a grocery store is.
The rind and blackish interior suggest a mushroom in the genus Scleroderma, which are inedible to poisonous, at least in North American. Maybe not elsewhere in the world. I did a tiny bit of internet research into commercially canned puffballs. Some brands pictured their mushrooms with white interiors, which would point to a species of Lycoperdon. I found one brand that confirmed this. Lycoperdon puffballs are common in parts of North America, and are edible while white inside. But as they age and the spores mature they become dark brown and are considered inedible. I found one picture where the interiors of a large handful of canned puffballs showed a gradient from white to black. Maybe some brands aren't as picky about the age of the puffball they put in cans. Or maybe we're just pickier about our puffballs than most cultures.