For the chef's sauce, mix mayonnaise, sesame oil and Sriraga sauce well.
For the sweet mushrooms, clean both varieties, wash briefly, dab dry well. Caramelize brown sugar until golden yellow. Deglaze with soy sauce, orange juice and stock, bring to the boil and simmer for about 5 minutes until the caramel has dissolved.
Stir starch and 1 tablespoon of water until smooth. Stir into the boiling sauce, continue to simmer for about 3 minutes.
In the meantime dab the fillet dry and salt it. Heat 2 tablespoons of oil in a frying pan. Fry the fillet for about 10 minutes. Take it out and let it rest briefly. Heat 2 tbsp. oil in hot frying fat. Fry the mushrooms until golden brown.
Add the sauce and bring to the boil. Cut fillet into approx. 3 mm thin slices and arrange. Add mushroom sauce and drizzle with Chef's sauce. Crunchy turnips taste good with it.