In a bowl put panko bread crumbs and another bowl put corn starch. Dredge the shrimp in the corn starch, then again in the milk and finally in the panko bread crumbs & set aside.
Heat a large skillet to 300 degrees F. Drop shrimp in and fry until golden brown. Remove from oil with a slotted spoon. Drain fried shrimp on paper towels lined plate.
In a large bowl combine fried shrimp with prepared sauce until evenly coated. Pile high on a bed of shredded cabbage and garnish with scallions.