Creamy Cucumber Tomato Salad

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• 1 English cucumber(sliced into half moons or circles, don’t cut it too thin)
• 1 large beefsteak tomato(sliced into quarters)
• 1 cup brown onion(sliced (cut the long strips in half))
• 5 tablespoons sour cream(or low fat sour cream or Greek yogurt)
• 1 salt and black pepper(to taste)
• 1 parsley or dill(for garnish)
• 0.5 small lemon