1. Wash, cut the zucchini in half and remove the seeds, then dice it.
2. Peel and dice the carrots.
3. Wash and cut the snow peas diagonally.
4. Arrange the vegetables in separate microwave-safe dishes.
5. Add 10 cl of water for the carrots, 5 cl of water for the snow peas, and 2 cl of water for the zucchini, then cover them with microwave-safe film and pierce it with a few holes.
6. Combine the remaining vegetables, add olive oil, season and mix well, then cover with microwave-safe film to keep them warm.
7. Cook them separately on high power: 8 to 10 minutes for the carrots, 5 to 6 minutes for the snow peas, and 3 to 4 minutes for the zucchini, then let them rest for about 3 minutes covered.
8. Set aside some carrots and zucchini for the ballotine and dice them.
9. Blend the fish in a food processor with the egg whites and heavy cream, then season with salt and pepper.
10. Add the diced vegetables to the filling and mix well.
11. Cut two rectangles of microwave-safe film on the work surface.
12. Place the fish mousse in the center of each rectangle.
13. Roll the films to form cylinders, then roll the cylinders tightly and close them with kitchen twine or by tying knots with the film.
14. Steam the ballotines for about 10 minutes.
15. FOR THE PLATING:
Finely chop the dill.
16. Remove the plastic wrap from the ballotines. Trim the ends and cut them diagonally.
17. Divide two pieces onto each plate, add the garnish, and sprinkle with dill.