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Preheat oven to 350 degrees. In a Dutch oven heat 2 tbsp. of oil. Add the onions, celery, carrot and garlic. Saute until tender. Remove from heat. Add the bread, salt, pepper, and mix.
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Pat the steak dry and score both sides, cutting in about 1/8 of an inch. Take the bread mixture and place on the center of the steak lengthwise. Roll up the steak and use skewers to hold it together.
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In the Dutch oven heat 1 tbs. oil. Add the steak and brown on all sides. Add the mushrooms and their liquid over the top of the steak. Cover and place in the oven. Bake for 1 1/2 hours.
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Place steak on a large platter. Pour the mushrooms and the liquid into a bowl. If there is any fat skim it off. Take about 1 cup of liquid and and put it back in the pot on top of the stove.
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Mix the flour with 2 tbs. of water. When smooth add it to the pot. Stir and bring to a boil. Lower heat and cook for a minute or two. Slice meat and serve with the gravy.