How to Make It
Devein shrimp, and remove legs from shells, if desired. (Do not remove shells from shrimp.) Combine 1 cup boiling water, salt, and 2 1/2 tablespoons honey in a large bowl; stir until the salt dissolves. Add ice cubes; stir until mixture cools. Add shrimp, and refrigerate 20 minutes. Remove shrimp from bowl, discarding liquid. Pat shrimp dry with paper towels; toss shrimp with 1 1/2 teaspoons honey.
Preheat grill to medium-high heat.
Place red wine vinegar and remaining 2 tablespoons honey in a large bowl; stir with a whisk to combine. Gradually add olive oil, stirring constantly with a whisk until well blended. Stir in parsley, onion, oregano, and garlic.
Arrange unpeeled shrimp on grill grates coated with cooking spray; grill shrimp, uncovered, 2 1/2 minutes on each side or until lightly charred and cooked through. Add shrimp to bowl with vinegar mixture; toss well to coat. Arrange shrimp mixture on a platter; top with sliced Fresno chile.