If using frozen prawns, thaw them under running water and pat dry. Slice lengthwise into halves (optional).
Heat 1 tbsp of cooking oil to high in a large pan. Add the shiitake caps and fry for 2-3 minutes until browned. Season lightly with salt. Transfer onto a paper towel.
Pour another 2 tbsp of cooking oil into the same pan. Add the prawns and season them with granulated garlic. Fry for 3-5 minutes, depending on the size, until they turn deep brown and are cooked through. Remove from the pan and let cool down to room temperature.
In a saucepan, heat the remaining oil to medium. Add the garlic chips and deep fry for about a minute, until they turn light golden. Remove with a blotted spoon and place onto a paper towel. Reserve the oil.
In a small bowl, mix 2 tbsp of flour with 1 tsp of salt. Coat the eggplant pieces with the mixture.
Heat the reserved oil to high and fry the eggplant in batches, for about 1-2 minutes, until the sides turn deep golden and crispy. Transfer to a paper towel to drain excess oil and let cool.
Prepare the dressing by whisking together 2 tbsp of soy sauce, 1 tbsp of sesame oil, orange and lemon juices and 1 tsp of truffle oil. Taste and adjust for acidity. If you like it hot, add 1/2 tsp red chili flakes.
In a large bowl, combine ruccola, prawns, shiitakes, eggplant and tomatoes. Gently toss with 3/4 of the dressing.
Transfer the salad onto a serving plate. Top with garlic chips and basil leaves.
Drizzle over the remaining dressing and finish off with a couple of grinds of mixed or black pepper mill.