Dalda is a popular brand of hydrogenated vegetable oil since 1930s. It was originally imported by a trading company Dada Limited. When an Indian subsidiary of Unilever called Hindustan Lever Limited wanted to brand it, they added L (for Lever Limited) to Dada and there came DALDA.
Dalda is known as vanaspati ghee as opposed to ghee derived from cow or buffalo.
Bunge Limited now owns Dalda and is offering new variants of Dalda in India. These are lower in Trans Fats at the same time have long shelf life.
The picture shows Hindi Film music director Anil Biswas cooking for Lata Mangeshkar. Tins of Dalda are conspicuously present.