In a large saucepan combine vinegar, sugar, 1/4 cup water, cinnamon, 1/4 teaspoon salt, and cloves. Bring to boiling, stir occasionally. Stir in onion. Return to boiling; reduce heat. Simmer, covered, 10 minutes or until tender. Place beets in large bowl; pour onion mixture over beets. Let stand, covered, 30 minutes. Refrigerate 8 hours before serving. Drain before serving. Serve with crumbled feta cheese and parsley. Makes 8 servings.