Suggest you say nothing about him cooking for a little while.
Then one weekend ask for some help to prep, just carrots for example. Chat together nicely about anything but actual cooking.
Leave it a bit, then another weekend, whilst prepping carrots, mention your aching wrist, 'love, be a dear, put some water in a saucepan for me and put it on the stove.' When boiling, 'throw carrots in and tell me when twenty minutes is up. '
Well, that's how Nanna and our daughters got their kids cooking, strikes me he's at that level.
Or, buy him a day course for handmade bread, that's usually considered a manly thing to do.
Or, take the view none of us is perfect and accept there's one thing he can't do and enjoy the rest of him.