1. Bring water to a boil in a large saucepan. Add sugar snap peas; cook 30 seconds or until crisp-tender. Drain and rinse with cold water; drain. Cut half of peas in half diagonally.
2. Heat butter in a large saucepan over medium-high heat; swirl until butter melts. Stir in lemon juice. Add peas and radishes; toss to coat. Sprinkle with chives, pepper, and salt.