Hello everyone. I was enjoying a tomato salad I made for lunch today and noticed these black lined inside my tomato slices as I was eating it. Any idea what they might be and if they're safe to eat? Or am I looking at some kind of fungus here? The exterior of the tomatoes are all blemish free and evenly coloured - just the insides have these black lines. I've checked some of my other tomatoes and they have it too.
Any opinions appreciated!