Heat a large grill pan coated with cooking spray over medium-high heat.
Cut plantain in half lengthwise; cut each half crosswise into 2 pieces. Spray plantain pieces with cooking spray; grill 4 minutes on each side or until golden and slightly soft. Sprinkle with 1/8 teaspoon salt.
Drizzle fish with juice; sprinkle with 1/8 teaspoon salt and minced cilantro. Grill 4 minutes on each side or until fish flakes easily when tested with a fork. Top fish with salsa and sour cream, and serve with plantain pieces. Garnish with chopped cilantro, if desired.
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