Fill a medium saucepan three-quarters with water. Add the lemon juice and bring to a boil. Add a pinch of salt and then drop the shrimp into the boiling water, cook until the shrimp are opaque, 2 to 3 minutes.
While shrimp cooks, create an ice bath. Drain the shrimp and place in the ice bath. Once cooled, drain the shrimp and pat off any excess water. Set aside.
Combine the vinegar, apples, carrots, cucumbers, jalapenos and scallions in a bowl. Season the salad with salt and pepper.
To assemble the wraps, lay out the lettuce leaves. Divide the poached shrimp and salad among the leaves. Top each with a sprig of cilantro.
To prepare ahead of time, pack the lettuce, shrimp and 1/4 cup salad in separate containers and assemble when you're ready to eat.
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