1. FOR THE MEDALLIONS:
2. Lay out the fillets, drizzle with olive oil and sprinkle with some dill.
3. Roll them up and secure with a toothpick.
4. Roll them up on themselves and wrap them in plastic wrap, twisting the ends.
5. Cook them in boiling water for 5 minutes.
6. FOR THE SAUCE:
7. Peel the shrimp, put the heads in a saucepan with 2 large bowls of water and boil them to make a broth.
8. Strain the broth.
9. In a pan, melt the butter and gradually add the flour to make a roux.
10. Add the white wine, then 1 bowl of broth, a little dill, and the heavy cream.
11. Let it thicken over low heat.
12. Meanwhile, sauté the onion in olive oil along with the shrimp (they should be well browned).
13. Add the onion and shrimp to the sauce.
14. Sear the medallions without the plastic wrap for a few minutes.
15. Add the medallions to the sauce.
16. It's ready!!!!!!!
17. Serve with rice.