Warm flatbread or pita on a lightly greased griddle for one minutes on each side. Keep warm. Cut meat loaf into very thin slices. In a large skillet, fry meat loaf in 1 Tbsp. unsalted butter in batches until warmed through and crisp.
On each pita bread, layer the tomato, onion and meatloaf slices. Top with tzatziki sauce. Fold pitas in half. Serve with remaining sauce.
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