Defrost the prawns. Pour boiling water over the noodles in a bowl and let them simmer for about 5 minutes until al dente. Pour into a sieve, rinse with cold water and drain. Cut into smaller pieces with kitchen scissors. Wash the chives, shake dry and cut into fine rolls. Clean the chillies, halve them lengthwise, remove seeds, wash and cut into fine strips. Rinse shrimps cold and drain.
Whisk the eggs, then add the noodles, prawns, chives, chilli and 1⁄2 tsp. salt. Heat a heart waffle iron and brush thoroughly with oil. Bake a total of approx. 8 large waffles, but spread 2-3 tablespoons of the pasta omelette mix in the waffle iron (the mixture should not completely fill the waffle iron surface). If necessary, drizzle some of the liquid egg mixture on top. Close the iron and bake the omelette wafers for about 4 minutes each until golden brown. Keep warm in a hot oven (electric cooker: 80 °C/circulating air: 60 °C/gas: see manufacturer) until all waffles are baked.
Stir mayonnaise with 1-2 tbsp. water until smooth and drizzle in strips over the waffles. Serve as desired with lettuce, cucumber and coriander. Sprinkle with Sriracha.