Onigirazu Rice Sandwiches - 2 ways

Name: Onigirazu Rice Sandwiches - 2 ways
Cook time: 30 min
Total time: 30 min
Cuisine: Japanese
Ingredients: 400g sushi rice; 490g water; 2 tbsp sushi vinegar; 2 tbsp white sugar; 1 tsp salt; 1 block of firm tofu, sliced in 0.5 cm thickness; 1 cup cornflour; salt & pepper to taste; 1 avocado; mayo; sriracha sauce; nori sheets; 12-15 king prawns, cleaned and de-shelled; 1 egg; 3 tbsp flour; 1 cup panko; kebab skewers