Make It
Step 1
Sprinkle beef with bouillon; set aside.
Step 2
Heat oil in large saucepan; brown beef on all sides. Add onion and garlic; cook until onion is tender. Add tomato sauce, water and chiles; reduce heat to medium-low and cover. Cook for 1 1/2 hours or until beef is fork tender and sauce is thick. Cool slightly and shred with two forks.
Step 3
Serve shredded beef with tostadas and toppings.
