Yum indeed! I also make sure to ask for an extra helping of the (dry) peanut chutney. That and the green chillies are must-haves with a vada pav for me :)
I've always heard it referred to as "Dana Chutney", Dana being a contraction of Shengdana.
I don't know if it's the same thing as Thecha, though -- but it does fit the description. I'm wondering if this is a geographical difference in culinary terminology :)
> And Portuguese colonialism. Practically all modern Punjabi food from makki to rajma is from South America.
Vindeloo is derived from Portuguese cuisine as well. In fact, the Portuguese are widely accredited with introducing spicy chili peppers into Indian cuisine.
I'll stop with this and refrain from mentioning how South Indian cuisine has been corrupted by Northern Indian cultural imperialism :)