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Every roadside stall in Mumbai has its own version, but the essentials never change: a spiced mashed potato filling, a punchy green chutney, raw vegetables for crunch, and a generous coat of butter before it hits the grill. Sold from carts near train stations across the city, this is a sandwich built for eating standing up, wrapped in newspaper.
Prep Time
20 min
Cook Time
15 min
Servings
2 people
Difficulty
medium

Per serving
340kcal
Calories
8g
Protein
46g
Carbs
14g
Fat
5g
Fiber
4g
Sugar
Follow step-by-step with voice guidance.
Heat the oil in a pan over medium heat. Add the mustard seeds and let them pop, then add the cumin seeds and let them sizzle for a few seconds.
Add the chopped green chili and grated ginger, cooking for 30 seconds until fragrant.
Add the mashed boiled potatoes, boiled green peas, turmeric powder, and salt, mixing well. Cook for 3-4 minutes, mashing lightly as you go, until well combined.
Stir in the chopped coriander leaves and remove from the heat; set the potato filling aside to cool slightly.
For the green chutney, blend the coriander leaves, mint leaves, green chilies, garlic, lemon juice, and salt with a splash of water until smooth.
Butter one side of each bread slice, then spread a thin layer of green chutney over the buttered side.
On one slice, spread a layer of the potato filling, then arrange the onion, tomato, and cucumber slices on top; sprinkle with the sandwich masala (or chaat masala) and black pepper.
Top with the second bread slice, chutney side down, and press gently.
Toast the sandwich on a hot griddle, sandwich press, or tawa with a little extra butter, until both sides are golden and crisp, about 2-3 minutes per side.
Slice diagonally and serve immediately with extra green chutney and ketchup.
Butter Before the Chutney: Applying a layer of butter to the bread before the green chutney creates a moisture barrier that keeps the bread from turning soggy from the wet chutney and vegetables. Don't Skip the Tempering: Popping the mustard seeds and blooming the cumin in hot oil at the start builds a flavor base for the potato filling that plain mashed potatoes wouldn't have. Toast Until Deeply Golden: A properly toasted Mumbai sandwich should be crisp and deeply golden on the outside, not just warmed through - be generous with butter and give it enough time on the heat.
Sandwich masala is a special tangy-spicy blend sold in Indian grocery stores specifically for street-style sandwiches - if unavailable, chaat masala makes a very close substitute.
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