This is B. Smith's BBQ Sauce, great on ribs.
Melt butter in a large saucepan over medium heat.
Add onion and garlic; sauté 5 to 6 minutes or until tender.
Add remaining ingredients.
Bring to a boil; reduce heat, and simmer 30 minutes, stirring often.
Remove and discard lemon slices.
NOTE: Sauce can be made ahead and kept covered in refrigerator for up to 2 weeks.
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