1. Preheat oven to 400 degree F and arrange racks in upper and lower thirds of oven; lightly oil 2 large baking pans. Cut tops off pumpkins; remove and discard seeds from bottoms. Arrange pumpkin tops and bottoms, cut side down, on prepared pans. Roast, switching pans halfway through, until just tender but not falling apart, about 15 minutes for tops and 20 minutes for bottoms.
2. Meanwhile, heat oil in a 5-quart pot over moderate heat. Add squash, bell pepper, onion, garlic, chili powder, oregano and cumin; cook, stirring, until vegetables are softened, about 4 minutes. Add pork and cook, stirring and breaking up clumps, until no longer pink, about 6 minutes. Stir in kale, broth, and beans; simmer, stirring occasionally, 15 minutes. Stir in cilantro; salt and pepper to taste. Spoon into pumpkins and top with lids. Makes 12 servings.