Wash the shrimp clean, peel and devein. Put the shrimps in a food processor. Add egg white, salt, pepper, garlic powder, sugar, sesame oil, mushroom powder, oyster sauce, leeks (optional).
Add tapioca flour. Process them altogether. Transfer the shrimp filling in a bowl. Keep it chilled in the refrigerator. Remove the crust of the bread. Cut the toast into 4 squares. Set aside.
Take out the shrimp batter from the chiller. Prepare the toast. Brush one side of the toast with egg white. Take one to two teaspoons of the shrimp batter, put it on the toast. Brush another toast with egg white to top the shrimp filling. Brush the sides of the toast with egg white. Roll the sides on sesame seeds. This will seal the shrimps inside the toast. Set the shaped toasts on a pan, ready to fry. Prepare a wok with frying oil.
Heat the frying oil, you can use a deep wok or deep-fryer pan. Heat the oil and test with a bamboo stick. If you stick the bamboo stick and bubbles come out of it, the oil is hot enough to fry. Put in the toasts, let it fry for a while until the bottom sides is a little bit brown. Turn the bottom up and fry the other side until golden brown. Let it dry on the kitchen towel or on a cooling rack. Let the oil drain on kitchen towel. Make the dipping sauce simply by mixing mayonnaise and chilli sauce together. Mix well. Cut the toast in the center and dab with the menbosha sauce. Enjoy!
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Notes
When frying the toast, flip only once. This will help reduce the oil trapped inside the toast. Drain the oil right away and let them cool on a cooling rack.
Use coconut frying oil for better result. The fried food comes out even dryer with coconut oil.
You can substitute garlic powder with fresh garlic, just mince it finely.
Put the toast in the fridge first to make it easier to cut.