Heat the oil in a pan on medium heat, once hot add mustard seeds, after it pops add dals.
Once the dals turn golden brown add hing, broken red chilies, turmeric powder, curry leaves and washed grapes,
Mix it and cover it. Let it cook.
Grind the masala along with coconut without adding water first, then add water and grind it to a coarse consistency.
Add the masala to the grapes,
Add some water to the mixer jar and add that as well
Mix it well, add tamarind extract,
add salt, jaggery mix it well
Add enough water to get gojju consistency ,
Let it boil on medium low heat for 6 to 8 minutes.
Turn off the heat and add chopped coriander leaves.
Serve the gojju with rice, rotti, idli, chapathi....