The chef, who is an ambassador for the New Heli Appeal, was joined by André Garrett, executive chef at Corinthia London, to create a three-course feast for diners showcasing Cornish produce.
Around 150 guests attended the gala dinner, held at Corinthia London.
Ainsworth said: “It was a real pleasure to cook alongside André in such an amazing space, and I’m over the moon that such a large sum of money was raised for the Cornwall Air Ambulance.”
Earlier this week, Ainsworth announced his Cornwall-based restaurant, Rojano’s in the Square is to relaunch as Caffé Rojano in February after nine years of trading, after confirming the purchase of the freehold of the site.
Cornwall Air Ambulance critical care paramedic, Steve Garvey, also talked about the difference the new helicopter will make to the service his team can provide.
Following the meal, Brit-award winning singer Will Young provided entertainment for guests.
Jackie Stanley, appeal board member and event organiser, said: “It was a hugely successful evening. Thank you to Paul Ainsworth, Will Young and Trevor Owen and Antony Rush at Corinthia London for giving their time and expertise freely to make it a night to remember.
“What an amazing legacy to know that through everyone’s combined effort and generosity we are a huge step closer to bringing a new generation helicopter to Cornwall, which will help to save many more lives. A huge thank you from the bottom of my heart.”