Beef with mushroom

2 teaspoons olive oil 1 red onion , chopped 1 zucchini , shredded 3 carrots , shredded 1 yellow bell pepper , chopped 1 celery , chopped 8 mushrooms , chopped[...]

5 Tbsp all-purpose flour 1/2 tsp salt Freshly ground pepper to taste 2 1/2 pounds beef stew meat (in 1 inch chunks) 2 Tbsp butter or margarine 2-3 Tbsp[...]