Since my first reply I've experimented and tested some things with my dragon and a friends. He tried squishing blackberries into his salad. Get the juices on the leaves and such. Then giving the dragon a small bit of berry itself. Once shown the berry was in the salad, he happily ran and ate his salad willingly. Since it went so well with his dragon, we tested it with mine. Same reaction. My dragon loves grapes, blueberries, blackberries, and some strawberry but not as much as the others. (His dragon is only 5 or so months old, where as mine is 1 and a half years old. But both are stubborn with salad and this worked really well).
I use collard or mustard greens, with some cabbage and shredded carrots (mostly for water), and then a different fruit every other day. So he won't eat blueberries except every 6 days or so. Because it is an "occasional" thing according to most nutrition charts. I cut up all the fruits and mix it in, except my blue berries usually are whole because they're small blueberries, the larger ones get cut and some times I use them to get all the juices into the leaves.
It seems to work best if you hand feed or place one piece of fruit in front of them and let them try it. Then try another. If they enjoy both, then show them the piece of fruit going into salad. Maybe even move them close to the salad and show them the fruit is there by pushing a piece from the salad towards them. This is what gets my guy to eat his salad, and my friends baby beardie is the same. He will eat a whole salad in one sitting with some blackberries in it.
I hope these new suggestions help you out some. As far as pellets go, they aren't necessary I don't believe. If you want them to get those vitamins or anything from the salad, try dusting lightly with calcium or multi vitamins. But I usually just use greens and fruits.