I've had a lot of sandwiches in my life, but I think I've found The One. Or even The Two.
If you haven't gone to Good Food Cafe on Mass Ave yet, you should go for lunch as soon as possible and get either the Roasted Turkey with cranberry sauce & stuffing (aka the Gobbler) or the Roasted Red Pepper, Mozarella, and Pesto sandwiches.
The latter is a perfect balance of flavors -- sweet and smoky peppers, rich and creamy fresh mozarella, and intensely garlicky pesto -- on fresh, crispy bread with a chewy, tender crust. It's honestly the single best sandwich I've ever had. I've been told their gobbler is just as good.
Can anyone second this? Or if not, post YOUR favorite sandwich ever?