Apparently if you put mushrooms outside in sunlight the amount of vitamin D they contain increases.
This can only occur at the right time of year.
Mushrooms respond to UVB ultraviolet light in a way similar to that of 7-dehydrocholesterol in our skin. 7-dehydrocholesterol is converted to vitamin D3 by the action of UVB on the skin. This can only occur when the right wavelength of ultraviolet light can penetrate our atmosphere, which happens to be when whichever bit of the planet you are on is more directly facing the sun. For us here in the UK that is the summer months.
Here are some mushrooms which have not created any vitamin D from solar UVB as they were grown this week, even though they had a good view out of the kitchen window.
Even so, they don't need vitamin D to grow and it took only 4 days for them to get to this size.
After trimming that left 250g of oyster mushrooms, enough for a stir fry for two.
Here they are 3 days after first appearing.
And here after 2 days.
And here from the day before that.
Like an alien invasion of freakish predatory tentacles emerging from coffee bean waste.
They were very pleasant to eat.
But keep taking the vitamin D supplements.
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