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Put the cilantro and garlic in food processor and pulse until well combined.
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Add yogurt, lime peel and salt and pulse again until well combined.
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Mix the tuna, tomato, onion and lime juice.
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Add salt and pepper to taste.
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Place the tuna mixture over the tortilla.
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Top with slices of avocado, drizzle with cilantro lime crema and fresh cilantro.