Grandma Adams' Boston Baked Beans

This is my mother-in-laws famous Boston Baked Bean recipe. She serves it over freshly baked bread. Enjoy it people!

Ingredients:
3 cups assorted beans (navy, lima, pinto, red, kidney) sorted and soaked over night
1 small yellow onion
1/4 cup vegetable oil
3/4 tbsp salt
1/4 cup molasses
1/2 tsp sugar

Rinse beans after soaking them over night. Put them in medium sauce pan and just cover with water. Bring to low boil and allow to cook for 15-20 minutes. Put all other ingredients into a Boston Baked Bean pot. Ladle cooked beans over ingredients and bake at 350 for an hour uncovered. Turn heat down to 250, cover and bake for 8 more hours checking every 1-2 hours and adding water just to cover the beans. Last hour, cook uncovered to bake the top brown and nice.