Clean and pick through the crabmeat. Place in a bowl and put the bowl into an ice bath to keep cold. Combine all the remaining ingredients. Slowly fold in the crabmeat, Season with salt and pepper.
Peel the plantain and slice, very thin, on a slicing machine or mandolin. Fry in hot oil and remove. Slice the cucumber the lengthwise, on a mandoline or slicing machine.
Place the cucumber slices down 1 at a time and place a 1 tablespoon of crab mixture on 1 end. Then slowly roll it up and stand it up on its end.
Garnish with crumbled pieces of fried plantains and chervil.
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