Cook sushi rice according to package instructions. Once it's ready, add 2 tsp of sesame oil and mix.
Cut tofu into 2 cm/1 inch cubes.
Grate the carrot.
Cut cucumber into slices.
Cut radish into slices.
Cut the zucchini into sticks.
In a small bowl add peanut butter, sugar, ½ tsp sesame oil, 6 tbsp water and 1 ½ tbsp soy sauce. Mix until combined. Add salt to taste. If necessary, add extra water.
In a small non-stick pan add ½ tsp of sesame oil and the zucchini sticks. Cook until they soften, about 1-2 minutes. Add the bean sprouts, 1 tbsp of soy sauce, plus a pinch of salt. Cook until the bean sprouts are tender and translucent, about 1 minute.
To serve, add rice to a bowl and top with tofu, carrot, cucumber, radish, zucchini with bean sprouts and kimchi. Drizzle remaining 1 tbsp soy sauce to season (½ tbsp per serving). Serve with peanut sauce and lemon wedges if using.