I'm surprised I'm not the size of a whale considering all the Mexican food I've inhaled. One of my favourite spots for an Asada burrito is Pinches Tacos. Their food is consistently amazing, and they open till late.
My favourite is their Asada burrito pictured below [I never have beans in my burrito. Not the biggest fan of beans]. Plus, always make sure you ask for their hot sauce. It's to die for!