In a large, heavy saucepan, over medium heat, heat the oil and saute the onions and garlic for about 2 minutes or until soft.
Add the Squash, tomato sauce, vegetable broth, olives, sage, nutmeg, and hot pepper sauce. Cover and simmer for about 25 minutes, or until the squash is tender.
Add the beans, salt and pepper and simmer for about 2 minutes until the beans are heated.
This stew tastes even better the next day and will keep in the refrigerator for up to 3 days.