Heat oven to 300 degrees. Place coconut on a large baking sheet. Spread out evenly in a thin layer. Bake around 30 minutes. Stir around 3 or 4 times. Coconut should end up lightly toasted, not burnt.

Mix all ingredients together for the sauce in a LG saucepan or wok. Slowly bring to a simmer over medium low heat. Simmer until onion becomes tender. Remove from heat and cool until able to be worked with. Place in a blender and pulse until it becomes a smooth sauce.

Meanwhile, prepare prawns. Heat oil in a deep fryer to 360 degrees. Place flour in a bowl. Mix spices with dry tempura mix, then mix in the water. Adjust until it is like thin pancake batter. Place coconut in another bowl.

Cook 5-6 prawns at a time so the oil maintains temperature. Dredge in flour, then tempura, then coconut. Knock off excess. Hold tip of prawn in the oil for a couple seconds before dropping in. Fry for 2-3 minutes. Drain on paper towels.

To plate, spread sauce on the bottom. Arrange prawns, then garnish with a lemon slice. Serve immediately. Enjoy.