Wash and drain the spinach. Wash fish, dab dry and cut into cubes. Cook the rice in the cup covered in boiling water for about 12 minutes. Heat 1 tablespoon of oil in a large pan.
Fry the fish in the pan for 2-3 minutes until golden brown all around, season with salt and pepper and remove, keep warm. Peel and finely dice the onion. Add the spinach, 2 tablespoons of water and the diced onion to the pan and fry for approx. 3 minutes while tossing until the spinach collapses completely.
Add salmon. Season the spinach and salmon ragout with salt and pepper. Turn out the rice from the cups onto preheated plates. Serve the ragout, garnish with lemon wedges and spring onion rings.