If you read the black bean chili recipe and thought 'cook beans and tomatoes together? But that is forbidden!' you are correct that it is forbidden as a general rule (or at least not recommended).
But this ain't just cookin'. It's pressure cookin'. The rules change.
Beans cooked with tomato products work out if the cooktime is increased 3 or 4 times. Soaked black beans normally take 4-6 minutes, so the 30 minutes called for in the black bean chili recipe more meets the required increase.
An untested idea: it should be possible to make this recipe with unsoaked beans by increasing the water and increasing the cook time to 1 1/2 hours. I haven't tested this, so try at your own risk, but it looks like it'd work in theory.
Dave in MPLS / DISCLAIMER: I am not an actual rooster.
"It is better to light a candle than to curse the darkness"
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