If you can't find jícama-a sweet, crunchy root vegetable eaten raw-use English-cucumber rounds or put the crab mixture in a bowl and serve it with tortilla chips.
Can be prepared in 45 minutes or less.
garnish: about 40 fresh coriander leaves
Peel jícama and cut crosswise into 1/4-inch-thick rounds. Cut each round into 6 or 8 wedges. In a sealable plastic bag toss wedges with 1 tablespoon lime juice to coat. Wedges may be made 1 day ahead and chilled in bag.
Pick over crab meat, removing cartilage, and shred meat. Crab meat may be prepared 1 day ahead and chilled, covered. In a bowl combine crab meat, salsa, remaining tablespoon lime juice, and salt to taste.
Top each jícama wedge with 1 tablespoon crab mixture and a coriander leaf.