INGREDIENTS
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1/2 pound spaghettini (thin spaghetti)
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1/2 cup chopped red onion
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1/4 cup extra-virgin olive oil
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1 to 2 teaspoons sambal oelek or Sriracha sauce
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1/2 pound shelled cooked crabmeat, cut into 1-inch pieces (from about 1 1/4 pound thawed frozen king crab legs)
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2 pieces preserved lemon, pulp discarded and rind rinsed and finely chopped (1 tablespoon)
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1/3 cup finely chopped flat-leaf parsley
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2 tablespoons salted butter