First pat your filet dry to remove excess moisture. Then apply salt and pepper to begin forming a crust. Next, roll the filet in the salt and pepper mix. Then coarsely blend crimini mushrooms, salt, pepper, and garlic to taste, blitz. Boil a pot of water and once the water is at a boil, add the fingerling potatoes. Add salt to taste. Then put the mushroom mixture into a pan. DO NOT ADD BUTTER, FAT, OR ANY TYPE OF OIL. Begin heating the mushrooms until liquid begins to seep out of them. After the mushroom mixture is dry, put them on a plate to cool. Then dice one onion and heat a pan with oil. Once the oil is hot, begin sautéing the onions. At this point you will want to bring the heat down to a low medium heat. Let the onions continue sauntering until you see a nice golden color. Then add salt, sugar, and red wine and bring the sauce down to a simmer. Then heat a pan and once the oil is hot, add the filet into the pan. Do not be tempted to turn the meat too soon. Give it at least 1-2 m