1/2 pound fresh green beans, cut into 1-1/2-inch pieces
1/4 teaspoon pepper
2 medium cucumbers, halved lengthwise and cut into 1/4-inch slices
1/2 pound cherry tomatoes, halved
1 large red onion, halved and thinly sliced
1 cup thinly sliced fresh basil leaves, divided
1/2 cup olive oil
4 tablespoons cider vinegar
3 garlic cloves, minced
Place potatoes and 1/2 teaspoon salt in a Dutch oven; add water to cover. Bring to a boil. Reduce heat; cook, uncovered, until tender, 12-15 minutes. Drain; rinse with cold water. Pat dry.
Meanwhile, in a small saucepan, bring 1 cup water to a boil. Add beans; cook, uncovered, just until crisp-tender, 3-4 minutes. Drain; immediately drop into ice water. Drain and pat dry.
Peel and cube potatoes; sprinkle with remaining salt and the pepper. Transfer to a serving bowl. Add beans, cucumbers, tomatoes, onion and 3/4 cup basil leaves. Whisk together oil, vinegar and garlic. Drizzle over vegetables; toss to coat. Sprinkle with remaining basil.
Test Kitchen tips
Instead of blanching the green beans in a large amount of water, you can steam them for a few minutes.
Be sure to put the green beans in ice water immediately after they're cooked, otherwise they'll lose their crunch and fade in color.