Scrub potatoes, leave skins on, cut larger ones into 1-inch chunks
Place in pot, cover with cold water by 1 inch, add 1 tbsp salt
Bring to boil, reduce to medium, simmer 12-15 minutes until fork-tender
Don't overcook—should hold shape
Drain in colander, let steam dry 2-3 minutes
Make dressing: whisk olive oil, lemon juice, vinegar, garlic, Dijon, honey, oregano, zest, salt, pepper, red pepper flakes
Or shake in jar until emulsified, taste and adjust
Transfer warm potatoes to large bowl
Pour ¾ of dressing over warm potatoes, toss gently
Cool 10-15 minutes, stirring occasionally
Add olives, sun-dried tomatoes, onion, cucumber, cherry tomatoes, capers
Toss gently
Add feta, reserve some for topping, fold in gently
Fold in parsley, dill, oregano, reserve some for garnish
Add remaining dressing, toss, taste and adjust
Cover, refrigerate at least 1 hour up to 24 hours
Remove 15-20 minutes before serving, toss again
Top with reserved feta and herbs
Garnish with extra herbs, drizzle with olive oil
Serve at cool room temperature