That's sweet of you! I'd probably go with Layla's then. Good prices and not too heavy or adventurous for lunch. Maybe Kneads if they work on the west side. It's just more expensive, so a gift probably isn't going to go as far there. If your friend is working in northern Westport or Weston, Dilly Duck in Norwalk could be an option too (although it seems like they have egift cards turned off on their toast shop).

Work lunch always makes me think of Panera style food (like pre 2017 before it was bought and became terrible) - which Aux Delices is probably the closest to that, but it's not groundbreaking.