In medium skillet over medium-high heat, heat beef and jus, breaking up meat with spoon, 5 to 7 minutes or until beef is shredded and liquid is reduced by half.
Heat oven to 350°F. In a 10-inch ovenproof skillet over medium-high heat, heat oil. Add potatoes. Cook 5 to 7 minutes or until lightly browned. Add onions and zucchini. Cook 3 to 4 minutes or until vegetables are tender. Stir in shredded beef with juices. Season to taste with salt and pepper.
In medium bowl, whisk eggs. Stir in 2 tablespoons basil and cheese. Pour evenly over beef mixture. Bake 18 to 20 minutes or until eggs are set.
Sprinkle frittata with tomato and remaining basil. Cut into wedges.