Is he telling you he's starving? I love that look - mine used to look at the contents of his bowl then look at me with an 'is that all?' expression! Mind you he's currently on hunger strike - says he's waaaay to busy to waste time eating...
I feed AG too and don't bother much with extras although I give raw veg rather than cooked. Both of mine love carrots and I give them whole, like bones, although I do chuck some of the peelings in their bowls when I have them. They also like broccoli stalks (although not the flowers/florets). Someone on here recently said pumpkin is very good for dogs and supermarkets are still selling these off quite cheaply.
Another trick I used to try with my youngster was to presoak half his complete food before feeding. This increases the volume and made him think he was getting more food. It slowed him down too as he went through a stage of inhaling rather than chewing

Hope this helps