The Lunchorder Slack app gives you slash commands (and buttons!) to help compile your team's lunch orders into one list.
Start taking orders by executing the start command with a place and a deadline (in minutes) as arguments, like this:
/lunchorder start burger place 10m. Now the app will message everyone who is online in that channel asking for their orders for burger place.
The app remembers your orders and will show you buttons for subsequent orders after you've manually added them a first time.
After executing the start command the order taker/starter will receive a list of everyone's orders that continuously updates itself as orders are coming in.