Sauce: Thinly slice(繊維に沿って) onion like 2mm thin. (Not too thin not thick.) Very thinly slice pickled cucumber. Put it aside. Put veg oil and butter into pan and cook onions over medium heat. Then turn to low heat, cook slowly until they get browned. It takes more than 30min.
2
When the onion is browned, put flour into pan and mix well. Cook a little. Then put white wine and white wine vinegar and reduce the alcohol for around 5min.
3
After 5min, put veg stock and Dijon mustard then mix well. When it is thickened add sliced pickled cucumber.
4
Meat: Put salt(one pinch) both side. Leave for 10min. Pulling into shape with string.
5
Put veg oil and butter into a pan and warm up over medium heat. When the butter melt put the meat and cook until golden brown. Doing ARROSER(pour oil using spoon) during cook one side. Repeat same the other side.
6
When the meat cooked, leave them for 5min. And put them back to the sauce with juice. (寝かせている間に出たジュースも一緒にソースパンに肉を入れる)