Cook up the beans normally (soak, boil, simmer).
Pour yams into pot, including liquid. Smash lightly. Add tomato puree, stir through. Add spices, stir through. Add cooked beans, stir through. Simmer for for a few minutes to mellow out.

(*) Beans: I keep a 'bean bucket' of mixed beans, usually including pea beans, black-eyed peas, pinto beans, split peas, lentils, navy beans, pinto beans; often including great northern beans, roman beans, pink beans, chili beans, barley, and others. Whenever there's room in the bucket I pour in a bag of something that seems underrepresented.

From: SOAR the Searchable Online Archive of Recipes
Posted By: Stephen Tanner
Post Date: Mon, 27 Apr 1998