Beef Braised in Beer

4 slices bacon
2 onions, sliced
1 cup chopped celery
2 cups sliced carrots
1 lb mushroom , sliced
3 lb round steak
2 teaspoons salt
1/2 teaspoon black pepper
2 teaspoons grated lemon rind
2 cups beer
1 tablespoons flour
2 tablespoons water

Place the bacon on the bottom of a heavy saucepan. Spread the onion, celery, carrots and mushrooms over it. Add the meat and sprinkle with the salt, pepper and lemon rind. Cover and cook over a low heat for 1/2 hour, turning the meat several times. Add the beer, recover and cook for 2 1.2 hours longer. Skim the fat from the gravy. Mix the flour with the water and stir into the gravy until thickened. Cook five minutes longer. Slice the meat and serve with the gravy. Serves 3-4