Cucumber Salad with Smoked Salmon
1 cup plain Greek yogurt
1 cup light sour cream
1/2 lemon, juiced
2 tablespoons chopped fresh dill, or to taste
2 tablespoons capers, chopped
1 shallot, minced
1/2 teaspoon white vinegar, or to taste
salt and black pepper to taste
2 large cucumbers, peeled and sliced
2 tomatoes, sliced
1 (3 ounce) package smoked salmon, flaked