To prepare Coriander chutney, add all the ingredients in the blender and whizz until you get a smooth spread. Squeeze the lemon juice, mix them and taste. Season with more salt if needed.
Assembling the Sandwich
Spread the butter lavishly on both the slices of bread. Top it with coriander chutney. Arrange in layers of cucumber,tomato, onion, potato rings & beetroot slices on the bottom slice of the bread. Sprinkle some chat powder . Top it with the other slice . Cut them in squares or triangles, just as u enjoy. Serve immediately with ketchup.
I had run out of beetroot and hence did not add it to my sandwich.
Notes
You could make a double decker sandwich by adding an extra layer of bread to two sliced sandwich . Fill them in between with chutneys and potato rings.
If chat powder is not available at home , a good decent seasoning of salt and pepper will do the needful. Chat powder is easily available to buy across any Indian grocer.