Heat the oil in large
Dutch oven. Saute the onions until golden. Add the beef and garlic and continue to sauté until the beef is no longer pink. Add the tomatoes and cook for 3 minutes. Add the tomato paste, chilies, peanut butter and stir to combine. Add the water and bouillon cubes. Bring to a boil, reduce heat, cover, and simmer for 15 minutes, stirring occasionally. Add squash, cover, and continue to cook for 35-40 minutes or until the pumpkin is tender, stirring occasionally. Season with salt and pepper.