To prepare green
spread, take spinach, mint chutney and mayonnaise in a bowl and mix well. Add salt and crushed peppercorns and mix well.
To prepare red
spread, grate boiled beetroot into another bowl. Add tomato ketchup and mix. Add salt and crushed peppercorns and mix. Add mayonnaise and mix well.
To prepare yellow
spread, combine crushed corn kernels, mayonnaise and mustard paste in a third bowl and mix well.
Put some green spread
on 8 bread slices. Similarly, put some yellow spread on 8 bread slices and red spread on 8 bread slices each and keep all of them on the worktop.
Pile 1 red bread slice,
1 yellow bread slice, 1 green bread slice, 1 red bread slice, 1 yellow bread slice and 1 green bread slice on top of each other and cover with the remaining plain bread slice. Similarly, prepare the remaining 3 sandwiches.
Trim the edges of the
sandwiches with a serrated knife. Cut into triangles.
sandwiches on a serving platter and serve immediately.