Heat 2 tsp oil in a pan. Add mustard, cumin seeds, chopped chilli and ginger, and saute until fragrant.
Add onion, tomato, grated carrot, cabbage, and capsicum. Stir well. Cook for 2-3 minutes.
Add turmeric, chilli powder, garam masala, cumin powder, chat masala, and salt. Stir in 2 tsp tomato sauce. Garnish with fresh coriander.
Butter 4 slices of bread. Toast them lightly on a pan or toaster.
Spread the spicy veggie mixture on one buttered slice. Top with another buttered slice. Cut into halves or quarters.
Serve the spicy veggie sandwich warm and with tomato sauce