Step 1: Season and flour the pieces of meat.
Step 2: Heat 60ml of olive oil in a saucepan, on medium heat and sauté the meat for 5-10' until golden brown.
Step 3: Remove the meat from the saucepan, throw the oil away and slightly wipe down the saucepan. Heat the rest of the olive oil on medium heat.
Step 4: Put the celery, carrot, onion and mushrooms into the oil and cook for about 10', until tend