In Kensington Market, they are one of the culinary highlights, though it is a brick and mortar location rather than a street cart like many other food options around, meaning you will be able to find some seating. Once ordering, it was super hot inside and verrry slow, but we were in no rush.
They are a torta spot, a mexican sandwich. We went with the adobada, which features steak, cheese, onion, and avocado. A classic combo that's hard to beat. My quick take: get it.