Bring 1/2 l salted water to the boil. Peel onion. Peel and wash carrots. Dice both very finely. Pour rice into boiling salt water and cook according to package instructions.
Cut the chilli, remove the seeds, wash and cut into rings. Wash lemon balm and cut into strips. Steam onion, carrots and chilies in hot oil for about 5 minutes.
Squeeze the lime. Boil up coconut milk and 2 tablespoons of juice and salt. Wash fish, dab dry and dice. Covered in coconut stock and let simmer for 5-6 minutes.
Peel the mango, cut the flesh off the stone and dice finely. Warm up the carrot vegetables with lemon balm. Season with salt, pepper and the rest of the lime juice. Lift out the fish. Season stock with salt, pepper and lime, foam up with a hand blender.
Arrange everything, sprinkle with coconut chips.