Tender marinated tuna in a punchy citrus and vinegar mixture along with onion, jalapeño, tomato, and mango. A bit of ginger and Leon zest brighten everything up while a bit of coconut milk brings a creamy sweetness. Barely adapted from here. Serve this as an appetizer for 4 or as a main for 2.
In a large non-reactive bowl, combine tuna, tomatoes, onion, ginger, chiles, vinegar, lemon zest, lemon juice, salt, mango (if using). Using clean hands or a spoon, gently fold until well combined. Cover and refrigerate for at least 3 minutes and up to 15 minutes.
Set a fine-mesh strainer inside a medium bowl, and drain fish mixture; discard excess liquid. Add the coconut milk, if using and stir to combine. Transfer kinilaw to a serving bowl, sprinkle with edible flowers (if using), and serve immediately.