For the sauce: whisk together all ingredients, adjust amounts as needed to taste and set aside.
Mix together the breadcrumbs and coconut in a shallow bowl. Toss the shrimp in cornstarch, then dip into the egg, then coat very well with the breadcrumb coconut mixture, pressing the breading on with your hands. Then set aside.
Heat the oil in a sauté pan or skillet over medium heat to 300°F. Fry the shrimp on both sides until golden brown and cooked through. Once cooked, remove to a paper towel-lined plate to drain excess oil. Season with salt immediately.
Drizzle the sauce over the shrimp, garnish with scallions and serve with bread.