@ossobuco,
I couldn't think of anyone better to explain these sammies to! Starting with a nice chabatta split, layer the following (I may be missing something):
lemon aioli (aioli? looks weird)
fresh, local, mixed greens
mashed chickpea 'burger' grilled
shredded carrot
I adored this stand - New Seasons, I believe it's called. They also had saffron arancine (not sure why they spelled it with an e) stuffed with cheese and chopped, steamed kale. They had breaded and fried mashed potato balls. Mmmmm. I miss it already!