Whisk egg and milk. Stir in flour. Bake 4 thin pancakes one after the other in a pan with a little oil until golden brown. Let them cool down a bit. Finely chop the walnuts. Put 1 tablespoon aside for sprinkling. Mix the remaining nuts and nut nougat cream and spread it on the pancakes.
Roll up tightly and chill for about 20 minutes. In the meantime melt the sugar in a pan until golden brown. Deglaze with liqueur and juice, let it boil for about 2 minutes. Cut the pancakes into small pieces. Serve with the sauce. Sprinkle with remaining walnuts and serve decorated with mint