Roast the poblano pepper directly over a gas burner, turning, until charred all over. (Alternatively, broil the pepper.) Transfer to a cutting board to cool slightly and then peel, seed and chop. Heat the olive oil in a small skillet over medium heat. Add the garlic and cook, stirring occasionally, until softened and golden brown, 3 to 5 minutes; set aside to cool slightly.
Put the mint, cucumbers, lemon juice, oil and garlic mixture and chopped poblano in a blender and puree until smooth. Season with salt and black pepper.
Ladle the gazpacho into 4 small bowls and top evenly with the tomato, chives and crab or shrimp. Drizzle with oil.
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