not know A from a windmill

To be stupid. It references the vaguely similar shape of the letter A and a windmill. How do you manage to burn pasta? It's like you don't know A from a windmill.

Common Names:

Name	Pronounced	Usage
Kamen	-	Bulgarian
Adedayo	-	Western African, Yoruba
Lexia	LEKS-ee-ə, LEKS-yə	English
Hatty	HAT-ee	English
Olga	['ɔlgə]
Baltasar (2)	-	Biblical Greek