mangetout/mange-tout = french for snow peas
urad dal = lentils
dhaniya = coriander (dried seed of the cilantro plant)
jeera = cumin
masala dabba = special tin of commonly used spices in indian cooking, often containing the ingredients listed above.

A heavy wok can be used in place of a kadhai. In fact, a high sided heavy iron skillet may work as well.

I am curious what appliance you used to grind up the coconut and peppers. That doesn’t look like a mill and pestil.

Thanks for the recipe, I am going to pick a few things up and make it tomorrow.