2 garlic cloves, peeled and thinly sliced, crushed or grated
1/2 teaspoon crushed red pepper flakes, or 1 to 2 tablespoons jarred or canned jalapeno peppers (preferably red), drained, sliced, and diced, or to taste
Salt
1 pound spaghetti
1 (14-ounce) can diced tomatoes
1 1/4 cups chopped drained pitted black olives
2 tablespoons small capers, well rinsed and drained
2 to 3 tablespoons chopped fresh parsley leaves, for garnish, optional
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