"These spice-infused meatballs are a hit with crowds, so you may want to make a double batch. Their flavor improves when you make them a day ahead...."
INGREDIENTS
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3 tablespoons olive oil (divided)
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1 small yellow onion, finely diced
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Kosher salt
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1 teaspoon chili powder
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1 teaspoon ground cumin
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1/2 teaspoon firmly packed light brown sugar
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1/4 teaspoon ground cinnamon
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1/4 teaspoon chipotle powder
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Freshly ground black pepper
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1 tablespoon water
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8 ounces ground lamb
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8 ounces ground beef (preferably 85 percent lean)
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2 eggs, beaten
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1/2 cup finely chopped fresh cilantro (divided)
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1/4 cup toasted pine nuts, finely chopped (see note)
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2 tablespoons finely chopped currants or raisins
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1/3 cup plain, dry bread crumbs, up to 2 tablespoons more if needed
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3/4 cups tomato purée (such as Pomi brand strained tomatoes)
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1/2 cup homemade or reduced-sodium chicken broth
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1 tablespoon sherry vinegar