Heat oil in a large nonstick skillet over medium heat. Add eggplant and cook, stirring occasionally, until just softened, about 5 minutes. Add garlic and cook, stirring, until fragrant, 30 seconds to 1 minute. Add tomatoes, olives, vinegar, capers, salt, pepper and crushed red pepper (if using) and cook, stirring, until the tomatoes begin to break down, 5 to 7 minutes more.
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