Instructions: Peel jicama and cut in half. Finely chop half of jicama, or enough to measure 1/2 cup, and shred remaining half, or enough to measure 1/3 cup. Reserve any remaining for another use.

In a small bowl stir together jicama, crab, 1 1/2 tablespoons lime juice, scallion, chili, tomato and 1/4 teaspoon garlic. Season seviche with salt and pepper.

Halve avocado, reserving half for another use. In small bowl with a fork mash remaining avocado, remaining 1 1/2 teaspoons lime juice, and remaining 1/4 teaspoon garlic with salt to taste until smooth. Seviche and avocado mixtures may be made 4 hours ahead and chilled separately, their surfaces covered with plastic wrap.

Cut cucumber crosswise diagonally into twenty-four 1/4-inch-thick slices. Top each cucumber slice with 1/2 teaspoon avocado mixture and 1 teaspoon seviche mixture.

This recipe yields 24 hors doeuvres, serving 6.

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