I haven't explored much of Bethnal Green - to be honest I don't see it as particularly any better than a cross between Whitechapel and Mile End and not nearly as pleasant as Hackney/Broadway. A friend invited me for breakfast to a little place tucked behind the Bethnal Green tube and it was the first cafe in the area I have tried.
It's not a vego/vegan place, but it does have a good selection of food to cater toward those tastes.
The chipotle jackfruit tacos (homemade chipotle barbeque jackfruit, kale, jalapeños, avocado, crispy onion, salsa, spicy mayo) was an excellent dish full of vibrant colours, flavours and textures.
They do an excellent smoothie also and I will happily eat there again.