I imagine this map isn't counting legumes/lentils as vegetables. The Indian diet, especially vegetarian, is heavily lentil based. Lots of paneer (basically a cheese that also functions as a tofu-like ingredient for many dishes) too, and of course breads and rice as you mentioned. Also potatoes. I imagine most of those aren't considered vegetables by whatever source this map is using.

EDIT: Also of course India isn't nearly as vegetarian as people imagine. The surveys are kind of variable, but we're reasonably only sure somewhere between 20-30% of Indians are vegetarians per:

• https://indianexpress.com/article/india/more-men-eating-non-veg-than-before-nfhs-data-7920932/
• https://www.bbc.com/news/world-asia-india-43581122
• https://en.wikipedia.org/wiki/Vegetarianism_by_country