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In a large bowl combine ground meats, herbs and spices, eggs, and breadcrumbs. Mix together until combined.
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Cover bowl with plastic wrap and refrigerate for at least 1 hour.
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Make 2 inch balls (these may be flattened to make mini sliders for your pitas)
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On a hot grill, grill balls until fully cooked, about 10 minutes.
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Open up pitas and spread with hummus and 1 lettuce leaf.
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Place 2-3 lamb meatballs in pita and top with Tzatziki.
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Serve warm.