Here's my go-to recipe for Boston baked beans...it's a very easy recipe to get started with.
Dave's Boston Baked Beans
The traditional style...a bit heavier on the molasses than the brown sugar.
No need to soak your beans overnight with my recipe....try it. You'll like it.
1 lb navy pea beans
1/2 lb thick sliced bacon
1 large onion, sliced
1/4 cup brown sugar
3/4 cup molasses
2 tbsp prepared mustard
Heat oven to 300°
Rinse and sort beans in a colander, then place in a large dutch oven and cover with water by at least three inches.
Bring beans to a full boil, remove from heat , cover and let stand for 1 hour.
Return beans to a boil, reduce heat and simmer until beans are tender, about 1 hour.
In a large skillet, saute' the bacon and onion until onions are just translucent.
Drain beans and RESERVE 2 CUPS COOKING LIQUID
Add remaining ingredients to reserved liquid, then layer beans bacon and onions in dutch oven and pour liquid over. Add more liquid if necessary to insure beans are covered.
Bake for 5 to 7 hours, checking occasionally for liquid and stirring.