In a blender grind all the chutney ingredients to a smooth paste using no water or just about 1 to 2 tsp water. Keep in an airtight container in the refrigerator.
Assembling the bombay sandwich
Trim the edges of the bread slices if you want.
Butter the bread slices evenly and very well.
Now apply the coriander chutney to the slices.
Place all the veggie slices one by one.
Sprinkle the black salt and chaat masala on each one of them or alternately.
Cover the sandwich with the other bread slices.
Slice the sandwich into rectangles.
Serve immediately with tomato ketchup and the coriander chutney.