In a medium saucepan set over medium heat, melt the butter (if using). Add the sugar or honey, orange juice, cinnamon stick, bay leaf (if using), and vanilla, and bring to a boil. Cook until the sugar is dissolved, then turn down the heat to a slow simmer. Add the prunes and cook for about 8 minutes until soft. Add the pineapple or fruit chunks, and apples or pears, cover and continue cooking just until the fruit is tender but not falling apart, about 10 minutes. Add the fresh berries (if using), and cook just until soft. The compote should have a loose consistency, somewhere between a jam and a sauce; add more orange juice if the mixture thickens too much. Store covered in the refrigerator for up to 1 month.