Quinoa

Technically, quinoa isn’t a grain but a gluten-free grain-like seed, though it’s prepared similarly to grains. It’s high in protein and fibre, and a long list of added nutrients and amino acids, and originates from South America. It’s not necessarily budget friendly though, but a little goes a long way and you can use it as a porridge or salad base, adding in lots of other goodies to make it go further.