Take potatoes and wash and cut into cubes and boil until it is soft. Take a one pot, put it on medium heat. Add oil, let it heat. Add green chilies, turmeric powder, coriander powder and salt, let it cook all the masala for 2 minutes. Add boiled crushed potatoes and let it cook for 5 minutes.
Take a one pot, put it on medium heat. Add oil, let it heat. Add mustard seed, and cumin seeds and let it sputtered. Add red chili powder, turmeric powder, and salt, immediately add cubed cut tomatoes. Cook tomatoes until all the juices are dried.
Take any brand mint chatney.
Take 4 slices of bread and cut the edges. Spread the chatnies on the bread slices.
Assemble the chatney bread slices.
Assembled tricolor sandwich is ready to fry.
Take nonstick pan, let it heat the pan on medium heat. Add butter and let it heat.
Put the assembled tricolor chatney sandwich on pan and fry for 2-3 minutes.
Fry other side for 2-3 minutes.
Fry the edges of the tricolor chatney sandwich.
Fry all edges of the sandwich.
Cut tricolor chatney sandwich into diagonally.