For an early lunch (and if you do decide to try it, I can't stress the importance of getting there as soon as you can, as there *will* be a line):
- Tonton Garby (which opens at 9:30 AM on Fridays): a 2-3 minute walk from Central. One of the best sandwiches I've had...anywhere.
If either of you are into (or are interested in trying) Belgian lambic beer, you should have plenty of time to stop by one of the following breweries:
- Cantillon (which opens at 10 AM on Fridays): a brewery; five-minute walk from Midi.
- 3 Fonteinen (which opens at noon on Fridays): a brewery; 10-minute train ride from Midi south to Lot station, then a five-minute walk from the station.