While not really dark black, Purple Russian is a roma and grows really nice.It's not all that big, more of a normal roma size, but it does have decent flavor. I've grown it for years and like it as a fresh tomato.
I've also been hearing lots of great stuff about Brad's Black Heart from Wild Boar Farms. I will be growing it this year. While not a roma, the hearts are meatier than the regular types.
Until someone comes up with your ideal, those might be 2 to try.
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