In a bowl, combine the creme fraiche and the dijon mustard, stir well and try your best not to taste too much!
Then add the grated cheese, season salt and pepper to taste and stir again
Spread the mixture evenly over the ribs, leave for 1 hour so the meat can soak in the mustard a bit more. If pressed for time, cook straight away as long as the ribs are at room tempreture
Preheat the oven to 200°. Grease your roasting pan with the butter.
Spread the onions at the bottom of the dish and place the ribs on the onions
Pour the white wine.
Cook for 45 minutes and viola!