Heat the olive oil, garlic, and crushed red pepper in a large saucepan over medium heat until fragrant, about 2 minutes. Add the marinara sauce, olives, capers, parsley, and lemon zest. Reduce heat to low and simmer for about 15 minutes. Meanwhile, cook the linguine according to the package instructions. Drain and add the linguine to the sauce, tossing to coat. Transfer to a large serving dish and serve family-style.
Tip: Capers and olives are often packed in brine, which can make a dish very salty. If you are watching your salt intake, rinse them before cooking.
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