Boil Potatoes:
Boil the potatoes: Wash potatoes, halve any large ones, and simmer in salted water for 15-20 minutes until fork-tender.Add Green Beans:
Add the green beans: 5 minutes before potatoes are done, toss in green beans; then drain everything and refresh under cold water.Hard-Boil Eggs:
Hard-boil the eggs: Submerge eggs in water, bring to a boil, and cook for 9-12 minutes; transfer to an ice bath.Whisk Dressing:
Prepare the dressing: In a bowl, whisk olive oil, lemon juice, white wine vinegar, minced garlic, and Dijon mustard until emulsified.Combine Salad Ingredients:
Assemble: In a large mixing bowl, combine potatoes, green beans, and quartered eggs; fold in capers and olives gently.Drizzle Vinaigrette:
Add the dressing: Drizzle the vinaigrette over the salad, toss lightly, and allow to rest for 10 minutes.Garnish with Herbs:
Garnish: Scatter fresh herbs over top and season with salt and pepper as desired.