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1
To prepare sauce: in bowl of a food processor, combine onion, garlic, celery, carrot and lemon zest.
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2
Process until minced.
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3
Place large saucepan or flameproof casserole over medium-low heat, and add oil and butter.
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4
Add minced vegetables and salt to taste.
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5
Saute gently until softened but not browned, about 10 minutes.
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6
Add sugar, passata and 2 cups water.
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7
Cover, and simmer 15 minutes.
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8
Add milk, and cook, uncovered, 15 minutes more.
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9
Meanwhile, begin preparing meatballs.
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10
To prepare meatballs: in a large bowl, combine ground turkey, ground pork, bread crumbs, garlic and egg; mix well.
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11
Add pecorino, basil, and salt and pepper to taste.
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12
Mix until thoroughly blended.
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13
Line a large baking sheet with plastic wrap.
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14
Dampen hands with cold water, and roll rounded teaspoonfuls of meatball mixture, placing meatballs on sheet; there should be about 80.
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15
Add meatballs to simmering sauce, shaking pan gently to make room as they are dropped in; do not stir.
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16
Simmer, partly covered, until meat is cooked through, 20 to 25 minutes.
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17
To serve, transfer meatballs and sauce to a serving bowl, and sprinkle with pine nuts and whole basil leaves.
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18
Serve, if desired, with cooked rice, garnishing each serving with more pine nuts and chopped basil.