Take mixer grinder. add all the ingredients of chutney with pinch of water and lemon juice. make fine paste and keep aside.

Slice well the both tomatoes, potatoes and cucumber in large bowl. add chutney mix well smoothly.

Arrange three slices on board. apply butter on first. arrange tomato slices. now arrange potato slices on tomatoes. sprinkle little bit chunky chat. cover this with second slice. spread butter again on top. arrange cucumber slices and few potato slices. sprinkle chunky chat and cover it with 3rd bread slice by little bit pressing. now with the help spoon take chutney from bowl. arrange this on top.

Make one cut from center to give the triangular shape. for smooth cutting use sharp edges utensil.