How to Make It
Bring a large pot of water to a boil. Add snap peas; cook 3 minutes. Drain and rinse snap peas under cold water.
Preheat grill to high.
Soak corn in cold water 10 minutes; shake off excess water. Grill corn 20 minutes, turning frequently. Cool corn, in husks, 10 minutes. Shuck corn; discard husks and silk.
Cut kernels from corn; place in a large bowl. Add snap peas and onions.
Combine olive oil and remaining ingredients in a medium bowl. Add to corn mixture, tossing to coat.