Fillet the monkfish and use the bone to make stock. Cut the monkfish fillets in escalopes. Marinate the fish in salt, pepper, thyme, lemon juice and oil for 1 hour.
Blanch the lemon julienne by boiling in water for 3-4 minutes, then drain and rinse with cold water.
In a sauté pan, melt the butter, add the onions and cook gently until soft. Add the fis