Summer Succotash Salad

Place beans in a medium saucepan and cover with water. Bring to a boil. Reduce to a simmer and cook until tender, about 30 minutes for fresh beans, about 25 minutes for frozen. Drain well. Transfer to a large bowl.

Meanwhile, heat 1 tablespoon oil in a large skillet over medium heat. Add corn, onion, squash and zucchini and cook, stirring, until crisp-tender, 4 to 5 minutes. Add garlic and cook, stirring, until fragrant, 45 seconds to 1 minute. Add the cooked vegetables to the bowl of beans. Transfer to the refrigerator to cool for at least 1 hour.

When the beans and vegetables are cool, stir in tomatoes, celery and basil.

Whisk vinegar and mustard in a bowl. Add the remaining 3 tablespoons oil in a slow, steady stream, whisking constantly, until the dressing is creamy and well combined. Season with salt and pepper. Drizzle the dressing over the succotash and toss to coat.