Recipe for a favorite dish

French meat
Ingredients:
Onions, large - 1 pc. (100-120 g)
Vegetable oil - how much will go
Large potatoes - 3-4 pieces. (350-400 g)
Beef fillet - 300-400 g
Mayonnaise - to taste
Tomatoes - 8.10 pc. (650-700 g)
Mushrooms - 800g
Cheese - 70 g
Salt - to taste
Spices, herbs - to taste