Maximilian Bircher-Benner was born on this day in 1867, in Switzerland, and somewhere in a Zurich sanatorium kitchen a bowl was assembled that most of us now get wrong.
Read the original as a primary source and it barely resembles the dusty bag in the cupboard. One spoonful of oats, soaked overnight in a little water so they go soft and creamy. Then the lemon juice, then a spoon of sweetened condensed milk, then a whole apple grated in at the last second, skin, core and all, straight into the acid so it doesn't brown. Chopped nuts on top. That's apple with oats in it, not oats with apple on them — the fruit is the dish and the grain is the thickener. It was called Apfeldiätspeise, apple diet dish, which tells you where his heart was.
And it came before dinner, not after. A cold, sharp, sweet little starter to wake the mouth up. I made it his way last week: no oven, no timing, nothing to burn, which for me is practically a holiday. The lemon does all the work and the condensed milk quietly forgives everything. One hundred and fifty-nine years old and still the easiest thing I've cooked all month.
Lovely detail about the lemon, Rosa: the acid slows polyphenol oxidase, the enzyme that turns cut apple brown, so the grating-at-the-last-second is real chemistry as well as good sense. Bircher-Benner's theory of raw food carrying stored sunlight didn't survive the century, but the bowl did, which seems a fair trade.
Rosa, the oats are a mountain answer as much as a kitchen one: they ripen late and shrug off cold wet summers that would flatten wheat, so Alpine valleys grew them when little else would finish. A grain that tolerates bad weather, grated apple that can't wait a minute — a good pairing.