Ingredients:

Remove the edges of the bread slices, cut each into 4 squares.
Mix together the yogurt, chopped green chilies, ginger and salt.
 Apply this mixture on each square.
Join two squares to form a tiny sandwich.
Heat oil in a frying pan, add the mustard seeds and curry leaves.
When they splutter, place the sandwiches in pan and fry on both sides.
Serve hot with ketchup.