Steps
1In large bowl, toss beef with salt and pepper.
2Spray 6-quart Instant Pot™ insert with cooking spray. Select SAUTE; adjust to normal. Add oil to insert. Add beef in 2 batches; cook 2 to 4 minutes on first side until browned. Turn, and cook 2 to 4 minutes longer on second side or until browned; transfer to medium bowl. Add onions, mushrooms insert; cook 4 to 5 minutes, stirring occasionally, until onions start to soften.
3Add broth, tomato paste and beef to insert. Add carrots and celery on top of beef. Secure lid; set pressure valve to SEALING. Select MANUAL; cook on high pressure 45 minutes. Select CANCEL. Set pressure valve to VENTING to quick-release pressure.
4In small bowl, beat water and cornstarch with whisk. Select SAUTE; adjust to normal. Heat liquid to simmering. Gently stir in cornstarch mixture; cook 30 to 60 seconds, stirring frequently, until thickened. Select CANCEL.
