Heat the oil in a large skillet over medium-high heat. Add the onion, garlic, jalapeno, and celery, season with pepper, and cook, stirring, until soft and fragrant, about 4 minutes. Add the tomatoes, olives, and capers and cook, stirring, until hot, about 2 minutes more.
Remove from the heat and stir in the lemon juice and parsley.
This briny Mediterranean-like compote goes well with grilled or broiled fish.
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