Brush the center of 4 round appetizer plates wtih olive oil, then very lightly sprinkle with salt. Lay the tuna slices over the seasoned olive oil.
Combine the lemon juice, lemon zest, caper brine, and chiles in a small bowl. Spoon the mixture evenly over each slice of tuna. Drizzle the top of each plate with the remaining olive oil. Season the tuna with salt and pepper. Let stand for 2 to 4 minutes, depending on your desired texture, then serve immediately.
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