2 cups thinly sliced cucumbers (from 1 large English cucumber or 3 mini, peeled fully or in stripes if desired)
3 tablespoons thinly sliced shallot rings (from 1 shallot)
Freshly ground black pepper
1/4 cup full-fat Greek yogurt
1/4 cup buttermilk
1/4 cup torn or chopped fresh tender herbs, such as dill, tarragon, basil, parsley or dill
Transfer the cucumbers and shallots to a colander, sprinkle with 1/2 teaspoon salt, and toss to combine. Set aside to drain for at least 15 minutes or up to 1 hour.
Stir together the yogurt and buttermilk in a medium bowl. Taste and season with with salt and pepper, then stir in the cucumbers, shallots, and herbs.