Combine the beef with the seasonings

• Place the ground beef in a bowl.
• Add the water, taco seasoning and cornstarch.
• Mix everything together by hand until well combined.

Cook the beef with the onion

• Add the diced onion to a pan.
• Add the seasoned beef mixture to the pan.
• Cook for 15 minutes, stirring every 5 minutes, until thickened.

Serve

• Spoon the ground beef into taco shells.