Pesto Pasta with Peas & Tomatoes

Bring a large saucepan of water to a boil. Add 8 ounces pasta; cook for 3 minutes less than package instructions. Add 1 cup peas and continue cooking until the pasta and peas are tender, about 3 minutes more. Drain the pasta and peas.

Meanwhile, whisk ¼ cup pesto, 2 tablespoons mayonnaise, 1½ tablespoons vinegar, ¼ teaspoon salt and ¼ teaspoon pepper together in a large bowl. Add 1 cup tomatoes, the sliced scallion and the cooked pasta and peas. Stir until well combined. Serve warm or at room temperature.