This is a container with flames beneath it. Hence, it is the verb to cook.
Illustrative Text Reference:
Mohenjo-daro: Seal: M-89 a: Jagat Pati Joshi and Asko Parpola, 1987: Corpus of Indus Seals and Inscriptions: Volume 1: Page 36: Collections in India: Suomalainen Tiedeakatemia.
Image Credit:
Indus Script Sign Number 332: Sign List of the Indus Script: Iravatham Mahadevan, 1977: The Indus Script: Texts, Concordance and Tables: The Director General Archaeological Survey of India.