Is a salmon mignon a rolled stuffed piece of salmon? The cooking time will depend on what the stuffing is and how thick the roll is, but the main thing is not to overcook the salmon. For a stuffed 2cm thick roll I would brown it in a frying pan over medium heat for about 3 minutes each side then turn the heat right down and leave it for about 5 minutes. Then put on a warm serving dish to rest for another five minutes. Ideally the stuffing will be cooked but the salmon will still be slightly translucent in the centre.