Apple meringue cake… without egg? (Russian pastila)

So I recently came across pastila, which there’s a nice summary of and recipe here: https://www.atlasobscura.com/articles/how-to-make-pastila.amp

Tl;dr imagine apple fruit leather, but you whip the apple purée first until fluffy, add a bit of whipped egg white, and then when it dries out it retains air and is soft/spongey.

The various websites on this dessert make two very interesting claims, as follows:

  1. The egg white is apparently a later addition, and truly ancient pastila is only two ingredients: purée of baked apples and honey. Therefore, whipped apple purée alone is able to maintain fluffiness and structure to slowly dry out into a fluffy melt in mouth cake? Does anyone know about the food science involved, if there’s any known pitfalls regarding timeframes, moisture content of the purée etc. that would make a two-ingredient attempt fail? The recipes don’t include much sugar/honey and the mixture isn’t heated above 70C after it’s added, so I’m not sure what the deal is here. I do see mention that sour and possibly slightly underripe apples are needed for it, which suggests pectin is important.
  2. Because this is actually an apple preservation method and essentially fluffed fruit leather, supposedly pastila will last for up to a year at room temperature and not mould or rot. Would such a thing require a specific minimum sugar/honey content or is the drying + acidity of the apples primarily enough? The Kolomna museum pastilas are only 3% egg white and 17% sugar by weight, I’m not sure if I’d likely need to increase the sugar if I remove egg white.

Thanks in advance!

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