Place beans in large saucepan, cover with water and bring to a boil. Simmer for 2 minutes. Remove from heat and let stand, covered for 1 hour. Drain
In a small bowl, combine maple syrup, chili sauce, chopped onion,
salt and mustard. Place half the beans in 1 quart casserole, top with diced bacon, then remaining beans. Pour syrup mixture over beans.
Add boiling water. Cover and bake at 300 for 6 – 7 hours, adding more water as needed to keep beans moist.