Just to let you know, this post was written before I started the paleo diet to help ease my psoriasis. Nowadays I eat a more allergy-friendly diet, but leave these older, non-paleo posts up in case they are useful to readers, as I know not everyone eats the same as I do. Thanks for your understanding.
The restaurant is located near the entrance to the Oracle shopping centre; conveniently, some might say, next door to Krispy Kreme. Inside, heavy, rustic-looking wooden benches are sparse except for a pile of napkins, some salt and pepper and a bottle of Cholula Hot Sauce.
Ordering is easy enough, made even easier by the staff, who show you what you can get to fill your burrito or fajita and talk you through the ingredients. And fill it they do.
I chose a burrito, with rice and refried beans, crunchy lettuce, slow-cooked roast pork ("carnitas"), which is seasoned with bay, thyme and orange zest. I asked for a handful of Montery Jack cheese and some Pico de Gallo - a crunchy salsa made with onions, tomato, serrano chillies, lime juice and fresh coriander. After a daubing of sour cream, I chose a trickle of salsa verde - a green-coloured, mild salsa - although you can choose hot or extra spicy if you dare. You're then given your chunky burrito, wrapped in foil and placed in a little red basket. And then we sat, with South American music in the background, tucking in to our burritos with a slosh or two of that gorgeous hot sauce.
If carnitas aren't your thing, they will also fill your warm tortilla wrap with chicken, steak or vegetables. And they make mini burritos for the kids, too. Or, you can get a rice box or a salad box instead, or choose tacos if you like.
Mission Burrito claims to be authentic; they say that they've brought the real flavour of the burrito from the Mission District of San Francisco "the home of the burrito". I've never been there, so I can't say. But I will be going back to Mission Burrito. Their emphasis on the flavour of the food over any theatrical gimmicks is fantastic. And some might argue that £5.45 is a bit steep for a wrap. Firstly, when you see what goes into it - I'm talking quality and quantity here - and along with the fact that it will keep you going for most of the day, it's not bad at all. In fact, is 8am too early for a burrito craving?
Visit the Mission Burrito website (see their menu online), follow them on Twitter at @BurritoHQ or even better, visit one of their restaurants in Reading, Oxford, Bristol and Bath.