Slice the cucumbers: Thinly slice 12 small pickling cucumbers using a mandoline or sharp knife. Thin, even slices give mizeria its signature delicate texture.
Salt and rest: Toss the sliced cucumbers with 1 teaspoons kosher salt, for salting cucumbers and let sit for 5 minutes to draw out excess water.
Make the dressing: In a bowl, whisk together ½ cup full-fat sour cream, 2 tablespoons fresh dill, chopped, 1 tablespoons lemon juice, ½ teaspoon kosher salt, for dressing, and ½ teaspoon black pepper until smooth.
Combine and chill: Fold the cucumbers into the dressing until fully coated. Refrigerate or serve immdiately.
Top and serve: Finish with 2 tablespoons pickled red onion, for topping and a touch more fresh dill right before serving.