First cut the onion,tomato & capsicum into thin slices and keep everything ready.
Take a single slice of bread , apply tomato ketchup as per your need , and then arrange onions ,tomatoes & capsicum.
Then place single cheese slice on the top and close it with another bread. Heat the tava with butter. Now place the bread on the hot tawa and apply pressure on the top with the help of flat laddle(it helps to keep the sandwich together)
Cook on both sides until golden brown & crispy.
For grill the bread, turn on your grill and once the grill is ready,grease it with butter & place the sandwich on grill on close it. Cook it for 1&1/2 to 2 mins. That's it, your grilled veggie sandwich is ready.
Serve it with ketchup and any of your favorite juice.