For the cucumbers
Slice the cucumbers thinly (mandolin, spiralizer, or knife). Place the slices in a large bowl.
Toss them with 2 tsp sea salt, separate any stuck slices, and refrigerate for 15 minutes, tossing once halfway through. The salt pulls out excess water so your salad doesn’t get watery.
Rinse the cucumbers twice with cold water to remove surface salt, then place them in a colander. Press firmly to squeeze out as much liquid as possible. Pat dry with paper towels or a clean dish towel. Set aside.
For the dressing
Combine the vegan sour cream, vegan Greek-style yogurt, lemon juice, cracked pepper, and chopped dill in a bowl. Whisk until smooth and creamy. Taste and adjust lemon or pepper to your liking.
Finish & serve
Drain the red onion slices from their cold water bath (if you used it to mellow flavor) and pat dry.
Add cucumbers, onions, and vegan feta into the bowl with the dressing. Fold gently until everything coats evenly.
Chill the salad for at least 1 hour for best flavor, though you can eat it immediately if you’re impatient (I don’t blame you). Garnish with extra dill and cracked pepper just