Step 1

Bring a large pot of water to a boil over high. Fill a large bowl with ice water; set aside. Add sweet peas to boiling water; cook until tender and vibrant in color, about 1 minute. Transfer peas to ice water; let stand 2 minutes to stop the cooking process. Remove peas from ice water, and transfer to a plate lined with paper towels; pat dry.

Step 2

Preheat grill to low (250°F to 300°F). Wrap each ear of corn tightly in aluminum foil. Place wrapped corn on unoiled grates; grill, uncovered, turning occasionally, until corn is fragrant, about 10 minutes. Remove from grill. Increase grill heat to high (450°F to 500°F) to preheat for shrimp. Remove foil from corn, and discard. Cut corn from cobs; discard cobs. Reserve corn kernels from 1 cob (about 1 cup) for salad; place remaining corn kernels in a blender. Add sour cream and buttermilk to blender; process until smooth, about 1 minute. Stir in lemon juice, 1/2 teaspoon salt, and white pepper. Set aside coulis.

Step 3

Toss together shrimp, 1/2 tablespoon oil, 1/2 teaspoon salt, and 1/4 teaspoon black pepper in a bowl to coat shrimp. Thread shrimp evenly onto 4 (10-inch) bamboo skewers, threading in a “C” shape and leaving about 1 inch between shrimp. Place shrimp skewers on unoiled grates; grill, uncovered, turning occasionally, until shrimp are cooked through, 4 to 5 minutes. Remove from grill; set aside.

Step 4

Toss together asparagus ribbons, pea tendrils, fennel, radish, parsley, sweet peas, and reserved corn kernels in a medium bowl. Add vinegar, remaining 1/2 tablespoon oil, remaining 1/4 teaspoon salt, and remaining 1/4 teaspoon black pepper; gently toss to combine.

Step 5

Spoon 1/2 cup corn coulis in middle of each of 2 plates. Place salad, slightly off-center, on coulis; top evenly with shrimp skewers.