is it okay for my 9 month old to have hamburger?

I mash my sons hamburger meat up he has two teeth but he can chew. I'd either break it up if he is feeding himself if you feed him mash or break it up

should I break up in tiny pieces or put it in a baby blender ,

I gave my 6 month old some today but we are baby led weaning

I'm sure if you break it into tiny pieces it will be OK.

She has two teeth and munches on puffs bananas.

can he chew??