Looks like a cross between fruit split and catfacing - read the link below for an explanation. Not uncommon at this time of year

https://www.rhs.org.uk/advice/profile?pid=393

Here's a recipe for "Fried Green Tomatoes."

http://allrecipes.com/recipe/16760/best-fried-green-tomatoes/

Thanks for that. Yes, it looks like catfacing - which I'd never heard of. You learn something every day!

Aye you do, including me - I never realised this was called catfacing either, I've always just called it corky scarring, lol. I'm still wondering why its called catfacing though, looks nothing like a cat's face to me...