I wouldn't put it under the butt - think it would be way to greasy.
I too dice up a cooked fatty in my beans if I don't have any pork on hand.
As far as how long to cook them - just till they are hot - everything is cooked, you are just getting them hot.
Don't cut down on the recipe - make the whole thing. Even with 10 people you may not have leftovers.
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