Overnight Sun-Dried Tomatoes Just before bedtime, halve all of the tomatoes in a container of cherry tomatoes. In a large bowl, drizzle them with olive oil and sprinkle them with salt and pepper. Place them on a baking sheet and put them in the oven at 175 degrees F. They will be ready in the morning. If you want to keep them dry, you can store them in a plastic bag. If you want oiled tomatoes, store them in a jar covered with olive oil. They will keep indefinitely in the refrigerator.