This is a container of liquid with a heat source beneath it. Hence, it is the verb to brew.
Illustrative Text Reference:
Harappa: Tablet in bas-relief: H-228 A: Jagat Pati Joshi and Asko Parpola, 1987: Corpus of Indus Seals and Inscriptions: Volume 1: Page 215: Collections in India: Suomalainen Tiedeakatemia.
Image Credit:
Indus Script Sign Number 337: Sign List of the Indus Script: Iravatham Mahadevan, 1977: The Indus Script: Texts, Concordance and Tables: The Director General Archaeological Survey of India.