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[Searcher]

Frankly, milk as the possible object being represented by a circle pictogram would never come to my mind

It can be anything, maybe, even, cheese, but to know for sure we need, at least, know what this recipe is for: making cheese, yogurt or something else. Is it a remedy or just cooking? 
As for the milch:
In one of my posts I wrote that I think it's just a misspelling, I don't think it is regular. On this matter I'm inclined to believe Rene and Helmut, and I read that children often make such a mistake, miss the letter "l" in "milch".