Take 500 gm of Bhetki fish fillets in a food processor or mixer grinder. Add 1 piece of fresh green chili (cut into small pieces) and 2 stems of spring onions (finely chopped) to it.
Follow it with 1 tbsp of fresh coriander leaves and fresh mint (pudina) leaves. Also add 1 tsp of hoisin sauce, 1 tsp of oyster sauce, 1 tbsp of dark soy sauce, ½ tsp of regular table salt, and ½ tsp of crushed black pepper to it. (Pro tip: If you do not have hoisin sauce at home, you can skip it. If you do not have both hoisin and oyster sauce at home, you may use only dark soy sauce but it will compromise the taste).
Make a paste.
Transfer it to a plate.
Take 4 bread slices. Apply the fish paste on each. Spread it evenly with a knife or a spoon.
Sprinkle a bit of white sesame seeds on it. Press them gently with the knife or spoon so that they stick nicely to the fish paste.
Heat about 3 tbsp of refined oil in a frying pan.
Place the coated bread slices in it one by one with the side with the fish paste facing down as shown. Fry on a medium flame for about 2 minutes.
Flip.
Cook for another minute. Take them out when they turn to a love golden brown color on both sides. (Pro tip: Do not cook for a long time because Bhetki fish cooks quite quickly).
Place them on a plate lined with a piece of tissue paper to absorb the excess oil.
Your fish toasts are ready. Cut them diagonally, lay them on a plate, and serve them hot with any condiment or a hot cup of tea.