[cc]

Can't remember name s beef tomato. Some will ripen most probably won't. Should I remove some, would that help to ripen?

[JayG]

Not really a disease, the fruit is imperfectly formed - not that unusual with beefsteak tomatoes which sometimes forget the script!

[mumofstig]

It  is very common on the larger fruited varieties, as already said. It's called catfacing, if you want to find out more about it

[Kleftiwallah]

I regularly grow beesteak tom's and have seen brown grooves across the surface.  It doesn't detract on the flavour. Nothing as distinctive as yours though.

Cheers,  Tony.

[Deborah1]

I’ve got loads like that! They still taste good. I just cut out any of the ‘rougher’ bits

[Vagabond]

I lived in Spain for a good few years and I'd see the Spanish housewives carefully choosing the imperfect ones. I soon learnt that when it comes to big tomatoes, the rougher looking they were, and still with patches of green, the more delicious they were.