It was beyond irrelevant to know if this boy was Jewish.
If her pupil felt it was relevant to tell her, either directly, or indirectly by exploring Jewish heritage in his own work , then fine, no issues
But , absent that- what on earth was the relevance of Jewish "physicality" to Clanchy?
In the piece she’s pondering why, in this very-close-to-multicultural-London location, none of her pupils seem to have any other cultural or racial identity other than ‘normal, Miss’ (i.e. Essex born & bred look no further). She mentions not only the boy’s physical attributes but also his name as being a typical Jewish surname. She does exactly the same to a pupil with an Irish surname and equates both boys not being interested in claiming any heritage/ancestors as equally perplexing/interesting to her.
So far as all the "chocolate coloured skin" - why? I think we can all assume a Somali refugee won't be white.
In context in the book she’s often describing a multitude of different ethnicities and races and so she’s distinguishing skin colour tones as part of her description. She does the same to the white pupils too. You can argue that the food metaphors and ‘chocolate’ thing is cliched, and problematic, but the mere act of describing the skin tone/colour of a Somali person or an Afghan person isn’t racist in itself. Or is it?