Bhajji Pav is a Mumbai street sandwich built on fried snacks: assorted bhajji, meaning battered and deep-fried vegetables such as onion, potato, and chili, packed into pav with chutneys. The appeal is textural contrast taken to its logical end. You are putting crisp, hot, oil-fried fritters into a soft roll, then cutting the richness with a sharp green chutney, so every bite swings between crunch and pillow, fat and acid. It is snack food turned into a meal by the simple act of giving the bhajji a bread to live in.
The build runs in a clear order. Vegetables are sliced, dipped in a seasoned gram-flour batter, and fried until the coating sets crisp and deep gold. The pav is split and usually griddled, sometimes with a little butter, then smeared with chutney, most often a cilantro and green chili blend, on the cut faces. The fried bhajji go in hot, the roll is closed, and it is eaten immediately. Good execution depends on frying discipline: batter that fries crisp and dry, fritters drained so they do not weep oil into the crumb, and chutney bright enough to push back against the fat. Sloppy execution is bhajji fried at too low a heat so they come out pale and grease-logged, or assembled and left to sit until the coating goes soft and the pav turns slick. The contrast between crisp filling and soft bread is the entire point, so anything that kills the crunch kills the sandwich.
Variation is mostly about which fritters go in and how much heat rides along. Onion bhajji give sweetness and tangle; potato slices give starch and body; whole or chopped green chilies turn it sharp and hot for those who want it. Some stalls add a dusting of chaat masala or a swipe of a second, spicier chutney for more edge. This is a close cousin of the other Mumbai pav sandwiches, but it should not be confused with the vegetable-sabzi Bhaji Pav, which is a different dish and deserves its own article rather than being crowded in here. What defines bhajji pav specifically is that the filling is fried to order and the sandwich is a race against time before the crunch fades. Eaten fresh off the kadhai, with the chutney doing its job, it is one of the more satisfying cheap meals on a Mumbai street; eaten late, it is a soft, oily disappointment, and the difference is entirely in the timing.