I come here A LOT for their Vietnamese classic cold cut sandwiches.
For approximately $3 for a whole bun with fillings (there's no halfing option here), it's a pretty great deal compared to the expensive $7 buns you would buy at somewhere like banh mi boys for a similar item.
One of my favourite lunches to bring, they have pieces of meat, thinly sliced onions, carrots and pieces of parsley in this bun placed inside. I wouldn't recommend putting this in the fridge for a long time (maybe just a overnight) because the sauce might start to make everything soggy. If you're a spice eater too, they have the spicy version, so just let them know if you want spice or no spice in your bun.
In addition, they have a variety of Vietnamese foods such as meats, desserts, rice wrapped in leaf, etc.