1 Plunge the salmon steaks, 5 minutes in a pot of boiling salted water. Drain them. Bring 1 liter of water to a boil, dilute in the stock cubes. Add the rice, cook for 15 minutes. Drain
2 Cook the eggs for 10 minutes in a pan of water. Remove the shells. Thaw the spinach (pan or microwave), add the cream. Salt and pepper. Remove and chop the herbs, mix them with rice.
3 Roll out a puff pastry into a rectangle and place it on the baking sheet covered with baking paper. Place the rice, spinach, salmon steaks and hard-boiled eggs in the centre. Salt and pepper
4 Take the excess dough back to the filling. Spread the other dough in a rectangle, place it on the koulibiac. Seal the two doughs together, moistening the edges. Brush the top with the egg yolk diluted in a little water and create designs with a thin knife. Cover and place in a cool place for 15 minutes.
5 Preheat the oven to 200 °C (th 6). Bake the koulibiac and cook it 30/40 minutes, the dough should be golden. Serve for example with a whipped cream with dill.