Trim the sides of the bread slices.
Spread butter on one side of all the four bread slices.
Keep slice 1 with its buttered side facing up.
Place carrot filling on the buttered side of slice 1.
Place slice 2 on the carrot filling, butter side facing down.
Apply mayonnaise on the upper side of slice 2.
On this side of slice 2, place potato slices to cover the entire slice.
Then sprinkle salt, pepper and chaat masala.
Apply mayonnaise on one side of slice 3 (butter is already on one side)
Place slice 3 on the potatoes, its mayonnaise side facing down.
Now apply the coriander-coconut chutney on buttered side of slice 3.
Finally place the butter side of slice 4 on the chutney.
Stack the bread slices nicely and cut diagonally.
Tricolor sandwich is ready.