Although your baby doesn't need teeth to effectively implement the baby-led solids method, there are times when they can be quite serviceable. I tried quesadillas a few months ago, before Buttercup had teeth, and it didn't go over too well. She tried a piece, spat it out then ignored it.
Recently I made a quesadilla for my own lunch, and gave some to Buttercup. It was made with whole wheat tortillas, spinach, cheese, garlic and cumin. I cut it into little Buttercup-sized squares. She was much more interested now that she's got a few teeth. I've found she uses them to clamp on food while she pulls on it with her hand. Whatever works!
She definitely preferred the tortilla to the cheese. Whenever the melted cheese would squish out the sides and fall on her tray she would pick it up and try it, but spit it back out again.
PROS: good and easy multiple-food-group meal
CONS: teeth make this food more manageable