Put half of shrimp, egg, finely minced onion and soy sauce in food processor. Mix until it's a fine paste. Add other half of shrimp and mix to small chunks for better texture.
Remove crust from toast. Cut into triangles, because everything tastes better as triangles.
Smush paste on toast, roll over bread crumbs to cover paste.
Deep fry in oil at 170°C for ~5 minutes or until golden brown. Splash oil on top of the toast and flip half-way through. Or try to at least.
Serve with japanese mayo.
Orgasm.