In a small bowl or jar, whisk together the white vinegar, honey, lemon juice, Dijon mustard, and salt until smooth. Taste and adjust if you like it more tangy or more sweet.
Slice the Persian cucumbers into rounds or half-moons. Dice your beets, crumble the feta, and finely chop the herbs.
Add the cucumbers, beets, parsley, dill, and feta to a large mixing bowl. Pour over the vinaigrette and gently toss to combine.
Serve it up immediately, or pop it in the fridge for up to 2 hours to let the flavors deepen. The salad holds up well chilled, making it a solid meal prep option.