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To prepare meatballs, preheat oven to 425°F.
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Line a baking sheet with foil for easier clean-up.
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Mix meat, crumbs, soy sauce, ketchup, ginger and green onions until well combined.
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Press a thin layer of meat (about 1/8-inch) around each blackberry, sealing completely. Place on prepared baking sheet.
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Bake 10-12 minutes until meat is cooked, turning balls over half-way through for more even browning.
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Keep warm until serving.
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To prepare sauce, combine 1 package blackberries, hoisin sauce and ketchup in a small saucepan.
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Cook over medium heat, pressing or mashing blackberries into sauce. Simmer until heated through and slightly thickened.
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Serve sauce and meatballs warm. Offer toothpicks for dipping meatballs, or add meatballs to sauce.