Walnuts

One serving of Walnuts — 2 whole (15 g kernels) — comes to 101 kcal, 2.2 g protein, 1.5 g carbs and 9.6 g fat. Scaled to 100 g it works out to 673 kcal and 14.7 g protein, which makes it a moderate protein source for a nut & seed item. That single serving is about 6.7% of a 1,500 kcal day and 5.1% of a 2,000 kcal day, so it's more of a filler than a target-hitter on protein without much extra planning.

Walking off Walnuts takes roughly 2,525 steps, using the rough approximation of 0.04 kcal burned per step (a population-average estimate for a moderate walking pace, not a personalised number). At ₹15 a serving it costs about ₹136.4 for every 20 g of protein it delivers, which is a mid-to-high price for protein compared with dal, eggs or soya chunks. It fits nearly every Indian diet type, including vegetarian, Jain, vegan. It works at breakfast and the evening snack slot. It's commonly eaten on fasting days (Navratri/Ekadashi-style).

If you want variety without changing the macros much, the closest swaps in the nut & seed category are Almonds, Cashew nuts, Chia seeds, Coconut chutney — each keeps a similar role on the plate while shifting the exact protein-to-carb balance a little.