Soak 1/4 thinly sliced red onion in ice water, 20 minutes; drain. Meanwhile, cook a 9-ounce package cheese ravioli as the label directs; drain and rinse under cold water. Whisk 1 tablespoon each olive oil and lemon juice, 1 grated garlic clove, 1/2 teaspoon lemon zest, and salt and pepper to taste in a large bowl. Add the ravioli, onion, 1/2 cup halved cherry tomatoes, 1/4 cup chopped oil-cured olives and some chopped parsley; toss to combine.
Photograph by Antonis Achilleos