1. Cook butter beans in boiling salted water to cover 20 minutes or until tender; drain.
2. Sauté corn in 1 Tbsp. hot oil in a small skillet over medium-high heat 2 to 3 minutes or until crisp-tender.
3. Whisk together lemon juice, next 4 ingredients, and remaining 2 Tbsp. oil in a large bowl; stir in corn and butter beans. Serve immediately, or cover and chill up to 3 days.