What is the purpose of “kayfa akluka li-l-ḍabb” in the boastful Tamīmī example?

Tawjīh, Serious Intent in Jest, Feigned Ignorance, Qawl bi-l-Mūjib and Iṭrād

• To explain nutrition
• To undercut boasting through a comic question
• To construct an animal simile
• To list a pedigree