An Easy Basque Piperade Recipe - Spicy French Tomato and Pepper Sauce

Gather the ingredients. Heat the olive oil in a large skillet over medium heat. Sauté the onion, peppers, garlic, salt, paprika, black pepper, and sugar, stirring occasionally, for 10 minutes, until the vegetables are cooked through. Add the tomatoes to the cooked vegetables and simmer the mixture, uncovered, for 15 minutes, until most of the liquid has evaporated and the sauce has thickened.