For topping chop
tomato, onion, red capsicum, yellow capsicum and green capsicum and put into a bowl.
To make tomato
chutney, heat oil in a non-stick pan, add split black gram, mustard seeds, curry leaves, red chilli, garlic, onion, red chilli powder, turmeric powder, tomatoes, roasted chana dal and salt, mix well and cook on medium heat till the mixture gets chutney consistency.
Heat a little oil in a
non-stick dosa tawa, pour a ladle of batter and spread into a round uttappam. Cook till the underside is done, flip and drizzle a little oil all around and cook till the other side is similarly done. Cook more uttappams in the same way.
For each sandwich,
take one uttappam, spread some green chutney over it and place a second uttappam over it. Spread some red chutney over it. Place a third uttappam over this. Spread some chopped vegetables over this. Make more sandwiches in the same way.
sandwiches on individual serving plates and serve.