Wash all the veggies. Grate the carrot, deseed and chop tomatoes and chilies. Finely chop coriander leaves.
Boil the corn if using corn on the cob. If using frozen corn, skip boiling.
Cut avocado to 2 parts and remove the seed with the help of a spoon. Scoop out the avocado pulp and cut to small bites.
Add all the prepared ingredients to a bowl. Add oil, pepper, salt and lemon juice. Toss everything well.
Butter the bread slices ob both the sides. Spread the prepared mixture over the bread. Cover with another slice and toast in a sandwich toaster until golden.