Step 1

Preheat the oven to 375 degrees F (190 degrees C).

Step 2

Melt vegan margarine in a skillet over medium heat. Add onion. Cook and stir until translucent, about 5 minutes. Mix together with beans in a casserole dish.

Step 3

Stir relish, pickle juice, ketchup, molasses, tomato paste, brown sugar, hot sauce, liquid smoke, garlic powder, salt seasoning, and mustard together in a bowl. Add to the bean mixture and mix to coat.

Step 4

Bake in the preheated oven until sauce is thick and casserole is heated through, about 1 hour.