Quince Barbecue Sauce

Heat olive oil in large saute pan set over medium heat. Add the garlic, and cook until golden, about 3 minutes. Add the tomato sauce, and bring to a simmer.

Add quinces, sugar, vinegar, jalapeno, cinnamon, salt, lemon juice, and grappa, if using. Cook, stirring occasionally, until sauce thickens and quinces are soft and slightly broken down, 50 to 60 minutes. Store in an airtight container, refrigerated, up to 5 days.