Bonus: arrowroot holds up beautifully when used with acidic ingredients or frozen (not so with cornstarch), so feel free to batch cook and freeze your recipes. (downshiftology.com)
One thing to note though is NOT to add tomatoes or other acidic ingredients until after the beans are soft. (mamaeatsplants.com)
I wouldn't use foil for this dish since the marinade contains acidic ingredients. (marksdailyapple.com)