Tamarind Chutney, imli chutney, is not a sandwich and shouldn't be read as one. It is a sweet-sour tamarind and date chutney, a national-level Indian condiment whose entire job is to make other things taste finished. It is the dark, glossy sauce that defines chaat and dabeli: the sweet, sour, faintly smoky counterweight that sits opposite the bright green coriander-mint chutney on every snack vendor's table. Treating it on its own terms matters, because most of what makes a good bhel or dabeli or aloo tikki sing is the quality of this one sauce, and a bad jarred version flattens everything it touches.
The make is a slow reduction, and the proportions are the whole game. Tamarind pulp is soaked and strained to a smooth, seed-free liquid; dates, jaggery, or sugar are cooked into it for sweetness and body; and the pot is seasoned with roasted cumin, ginger, chilli, black salt, and often a pinch of chaat masala or asafoetida. It is simmered until it coats a spoon and falls in a slow ribbon, then cooled, at which point it thickens further, so it must be pulled off the heat slightly looser than the target. Good execution is a clean three-way balance: tamarind sourness up front, date-and-jaggery sweetness behind it, and a savory cumin-and-black-salt depth underneath, with a pourable but clinging consistency. Sloppy execution is one note swamping the rest, usually cloying sugar with no real tamarind bite, or a thin, watery sauce that slides off whatever it is meant to coat, or a gritty texture from unstrained pulp.
How it shifts is mostly a question of sweet-to-sour ratio and regional habit. Dabeli and many Gujarati uses run sweeter and thicker so the sauce stays put inside the pav; northern chaat stalls often keep it sharper and looser for drizzling over papdi and gol gappa. Some cooks deepen it with dried ginger and red chilli for a warmer, spicier profile; others keep it bright and fruit-forward. It is brushed inside dabeli and kachori, spooned over chaat, and used as a dip in its own right. The chaat and dabeli dishes that depend on it are substantial subjects and each deserves its own article rather than being crowded in here.