Knead the Dough: Mix flours, salt, sugar, and oil. Gradually add warm milk. Knead for 7 minutes until smooth and elastic. Cover with a damp cloth and rest for 45 minutes.
Double Marinate: Toss chicken slices with Marinade A for 15 minutes. Whisk Marinade B until smooth, then coat the chicken thoroughly.
Infuse Smoke: Place a red-hot charcoal in a small metal bowl inside the chicken container. Drizzle ghee over the coal, seal the lid immediately, and let smoke for 5 minutes.
Skewer: Thread the thin chicken slices onto soaked bamboo skewers by folding them accordion-style.
Cook Chicken: Sear skewers on a moderately hot greased skillet for 3–4 minutes per side until charred and tender. Remove from heat and rest.
Roll the Bread: Divide dough into small balls (35g). Roll each ball into a paper-thin, translucent circle using plenty of dry flour.
Flash Fry Bread: Place the flatbread on a very hot skillet. Cook for 10–15 seconds per side until tiny bubbles appear. Keep wrapped in a warm towel.
Prepare Onions: Slice onions thinly and soak in ice-cold water for 20 minutes to achieve maximum crunch and reduced pungency.
Assemble: Spread a layer of both green and red chutneys on the flatbread. Add the grilled chicken (off the skewer), chilled onions, a squeeze of lemon, and a dash of chaat masala.
Final Roll: Roll tightly into a slim cylinder and serve immediately while the bread is soft and the chicken is hot.