I really like Granny Smith apples. Can you tell me anything about them?
I love cooking with granny smith apples that have such a great flavor for a cooking apple. From my memory the origins are a bit fuzzy, but they were an accidental discovery by a lady in Australia in 1868.
Oh wow was she a Grandma by any chance lol.
I imagine she was, the apple variety was discovered shortly before her passing. She gave birth to 8 children in her life, 5 survived infancy so I would say there was a good chance she had grandkids. 
Well that is quite a progeny. I am sure she has many ancestors. So what color are the apples, red?
Granny Smith apples are typically green and turn yellow when they are over-ripened (aka rotten). They are a bit tart. 
Oh ok. I seem to remember they are often dipped in caramel and sold at fairs. They are quite delicious.
Granny Smith
The Granny Smith is a tip-bearing apple cultivar, which originated in Australia in 1868. It is named after Maria Ann Smith, who propagated the cultivar from a chance seedling. The tree is thought to be a hybrid of "Malus sylvestris", the European wild apple, with the North American apple "Malus pumila" as the polleniser.
The fruit is hard, with a light green skin and crisp, juicy flesh. The flavour is tart and acidic, which possibly limits raw consumption.
cooking and eating raw) are more widely grown.
Apples can be cooked down into sauce, apple butter, or fruit preserves. They can be baked in an oven and served with custard, and made into pies or apple crumble. In the UK roast pork is commonly served with cold apple sauce made from boiled and mashed apples. Bramley apple is by far the most popular cooking apple in the United Kingdom, while Granny Smith may be the most popular in the United States and Australia (where it originated).